APPLICATION NOTE 4059

DS33R41 Multichip-Module BSDL Testing


Abstract: This application note describes how to alter the printed wiring board (PWB) netlist of a design containing the DS33R41 Inverse-Multiplexing Ethernet Mapper with Integrated Quad Port T1/E1/J1 Transceiver so that the netlist complies with the Joint Test Action Group (JTAG) specifications. These changes are necessary because the DS33R41 was designed as a multichip module with multiple die in a single package which can not be defined by the Boundary-Scan Description Language (BSDL) for board level JTAG testing. The application note contains external pin mapping tables, internal die pad bond tables, and connection information allowing the designer to quickly achieve accurate JTAG boundary-scan board testing.

Introduction

When manufacturing hardware for a telecommunications system, one of the basic tasks is to test the system for any production flaws. While there are many ways to test the hardware, one of the most popular methods uses the Joint Test Action Group (JTAG) boundary-scan method. The boundary-scan test method involves some minor changes to the hardware before production so that hardware verification can be performed after production. During design, all of the Integrated Circuit (IC) devices which support JTAG are connected in a serial daisy-chain fashion through the JTAG test access port. Verification is done by a specialized JTAG test system which connects to the test access port. The JTAG test system then uses a combination of the printed wiring board (PWB) netlist, Boundary-Scan Description Language (BSDL) files, and PWB connectivity test vectors to verify the pin-to-pin connections.
BSDL testing is straightforward. Nonetheless, multichip module devices like the DS33R41 Inverse-Multiplexing Ethernet Mapper with Integrated Quad Port T1/E1/J1 Transceiver cannot be properly described by a single BSDL file because there are multiple die in a single package. This shortcoming can be overcome with simple modification to the PWB netlist and by using two BSDL files to describe the device package instead of just one.

Modifying the Printed Wiring Board Netlist

Before JTAG boundary scan testing can be performed, the portion of the PWB netlist that describes the external connections to the DS33R41 package must be modified to split those connections between the internal DS33Z41 die and DS21458 die. Once completed, the netlist will define the DS33R41 package with two independent reference designators. These reference designators allow two different BSDL files to individually describe the DS33Z41 and DS21458 connections inside the DS33R41 package.
Tables 1, 2, and 3 and Figure 1 make the task of modifying the netlist easy. Table 1 lists all of the external DS33R41 package pins which only connect to the DS33Z41 die. Table 2 lists all of the external DS33R41 package pins which only connect to the DS21458 die. Table 3 lists all of the external DS33R41 package pins which connect to both the DS33Z41 die and the DS21458 die. Figure 1 shows the same information in a format created for easier viewing.
This PWB netlist modification and JTAG boundary scan test have been performed using a Concise Net List format netlist of the DS33R41 engineering evaluation board designed with Cadence® Concept. Designers can perform the operation in approximately 30 to 60 minutes, depending on the netlist type and individual's skill level. Most of the edits to the netlist file can be done with a simple text editor. Depending on the netlist type, however, it may be possible to edit the netlist in a program such as Microsoft® Excel which can sort rows based on column data. However the editing is done, it is important to pay careful attention to detail. Irregular data such as header and footer information must be maintained, and the netlist must always be saved in the original format.
The following is a list of steps needed to complete the process.
  1. Open the netlist file in a text editor and group all of the nets connected to the DS33R41 reference designator. As an example, the DS33R41 package on the DS33R41 Engineering Evaluation board had a reference designator of U01.
  2. Separate all of the nets isolated in step 1 among those connected to the DS33Z41 die, those connected to the DS21458 die, and those connected to both dies. Use Tables 1, 2, and 3 and Figure 1 to complete this task.
  3. Change the reference designator for all of the DS33Z41 nets from U01 to U01_D1 (short for reference designator U01, device 1). This step assumes that the DS33R41 reference designator was U01. If the reference designator is not U01, change U01_D1 appropriately.
  4. Change the reference designator for all of the DS21458 nets from U01 to U01_D2 (short for reference designator U01, device 2). This assumes that the DS33R41 reference designator was U01. If it is not U01, change U01_D2 appropriately.
  5. Duplicate the 22 shared nets so that there is exactly two of each. Split them into two groups.
  6. Change the reference designator for first group of nets created in step 5 from U01 to U01_D1. This assumes that the DS33R41 reference designator was U01. If it is not U01, change U01_D1 appropriately.
  7. Change the reference designator for second group of nets created in step 5 from U01 to U01_D2. This assumes that the DS33R41 reference designator was U01. If it is not U01, change U01_D1 appropriately.
  8. Save the newly created netlist.
The newly created PCB netlist will actually contain two instances for the DS33R41 physical device. The first instance will describe the pin connections related to the DS33Z41 section; the second will describe pin connections related to the DS21458 section. The new netlist can be loaded into any JTAG test suite along with the two DS33R41 BSDL files and any associated test vectors.
Although the method documented here has been tested and verified to work properly, there can be some unforeseen complications with other netlist formats. If additional assistance is needed during JTAG boundary scan testing, please use the contact information below.
Table 1. Device Pins for DS33Z41 Die Only
Pin Description   Pin Description   Pin Description
A1 VSS   J18 RXD[2]   P13 VSS
B16 VDD3.3   J19 RXD[0]   P14 SDMASK[1]
B17 VDD3.3   J20 VSS   P15 SRAS
B19 VDD3.3   K3 VSS   P16 SDA[11]
B20 VDD3.3   K5 VSS   P17 VDD1.8
C19 VDD3.3   K6 VSS   P18 SDMASK[2]
C20 REF_CLK   K7 VSS   P19 SDATA[18]
D10 VDD3.3   K8 VSS   P20 SDATA[19]
D15 VSS   K13 RMIIMIIS   R11 VSS
D18 VDD3.3   K14 TCLKE   R12 SDATA[12]
D19 VDD3.3   K15 TSERO   R13 SDATA[6]
D20 VDD3.3   K16 TBSYNC   R14 SCAS
E19 VDD3.3   K17 JTDI1   R15 SDCS
E20 MDC   K18 RX_DV   R16 SBA[0]
F11 VSS   K19 RX_CLK   R17 SDA[10]
F14 VSS   K20 RX_ERR   R18 SDATA[31]
F18 VDD3.3   L4 VSS   R19 VSS
F19 VDD3.3   L5 VSS   R20 VDD1.8
F20 MDIO   L6 VSS   T11 SDATA[13]
G4 VSS   L7 VSS   T12 SDATA[14]
G5 VSS   L8 VSS   T13 SDATA[5]
G7 VSS   L14 RCLKI   T14 VDD1.8
G12 VSS   L15 RBSYNC   T15 SWE
G13 JTMS1   L16 RSERI   T16 SDA[8]
G14 JTRST1   L17 DCEDTES   T17 SDA[0]
G15 MODEC[1]   L18 TX_CLK   T18 SDATA[16]
G16 VDD3.3   L19 TX_EN   T19 SDATA[27]
G18 QOVF   L20 TXD[0]   T20 SDATA[26]
G19 REF_CLKO   M5 VSS   U11 SDATA[15]
G20 VSS   M6 VSS   U12 SDATA[4]
H5 VSS   M7 VSS   U13 VSS
H6 VSS   M12 VSS   U14 SDCLKO
H7 VSS   M13 VDD1.8   U15 VSS
H8 VSS   M14 SDATA[3]   U16 SDA[1]
H9 VSS   M15 SDATA[1]   U17 SDA[4]
H10 VSS   M16 VSS   U18 SDATA[29]
H14 JTDO1   M17 VDD1.8   U19 SDATA[25]
H15 RST   M18 TXD[2]   U20 SDATA[24]
H16 CS   M19 TXD[1]   V11 SDATA[11]
H18 RXD[1]   M20 TXD[3]   V12 SDATA[10]
H19 RXD[3]   N12 VSS   V13 SDATA[8]
H20 VSS   N14 VDD1.8   V14 VSS
J6 VSS   N15 VDD1.8   V15 SDA[9]
J7 VSS   N16 VDD1.8   V16 SDA[7]
J8 VSS   N17 VDD1.8   V17 SDMASK[3]
J9 VSS   N18 VSS   V18 SDATA[30]
J15 VSS   N19 RX_CRS/CRS_DV   V19 SDATA[22]
J16 VDD1.8   N20 COL_DET   V20 VDD1.8
J17 JTCLK1   P12 VSS   W11 SDATA[0]
W12 SDATA[9]   W19 SDATA[20]   T16 SDA[6]
W13 SDATA[7]   W20 SDATA[23]   Y17 SDA[2]
W14 VDD1.8   Y11 SDATA[2]   Y18 VDD1.8
W15 SBA[1]   Y12 VSS   Y19 SDATA[28]
W16 SDA[5]   Y13 SDMASK[0]   Y20 SDATA[21]
W17 SDA[3]   Y14 SYSCLKI      
W18 SDATA[17]   Y15 VDD1.8      
Table 2. Device Pins for DS21458 Die Only
Pin Description   Pin Description   Pin Description
A2 TSSYNC3   D3 TCHBLK3   G9 RNEGO2
A3 RMSYNC3   D4 RLOS/LOTC3   G10 DVSS
A4 RCHBLK3   D5 RSIG3   G11 DVSS
A5 RPOSO3   D6 TPD   G17 D0
A6 TSYSCLK3   D7 RNEGO3   H1 RCLK3
A9 TCLK2   D8 DVDD   H2 TSIG3
A10 TVDD   D9 DVDD   H3 DVSS
A11 TRING2   D11 DVDD   H4 TSYSCLK1
A12 TTIP2   D12 RCLKO2   H11 RSIG2
A13 TVSS   D13 TSYNC2   H12 RVSS
A14 TCHBLK2   D14 RCHCLK2   H13 RVSS
A15 RSYNC2   E1 TTIP3   J1 DVSS
B1 DVSS   E2 TTIP3   J2 TSERI3
B2 DVSS   E3 TCHCLK3   J3 TCLKT3
B3 RSYNC3   E5 RVSS   J4 DVDD
B4 RCHCLK3   E6 RTIP3   J5 TSYSCLK2
B5 RSERO3   E8 DVDD   J10 RPOSO2
B6 DVDD   E9 DVDD   J11 RVSS
B8 TSIG2   E10 DVDD   J12 RRING2
B9 TSERI2   E11 TCLKO2   J13 RTIP2
B10 TVDD   E12 TPOSO2   J14 RVDD
B11 TRING2   E13 TSSYNC2   K1 RSYSCLK1
B12 TTIP2   E14 RFSYNC2   K2 MCLK1
B13 TVSS   F1 TRING3   K4 RSERO1
B14 RCHBLK2   F2 TRING3   K9 RSERO2
C1 RCLKO3   F3 TNEGO3   K10 RSYSCLK2
C2 TSYNC3   F4 TPOSO3   L1 RVSS
C3 DVSS   F5 RVSS   L2 TRTRST
C4 RFSYNC3   F6 RRING3   L3 BPCLK1
C6 RSYSCLK3   F7 RVDD   L9 TCHCLK4
C7 JTDI2   F8 DVDD   L10 JTDO2
C8 RCLK2   F9 DVDD   L11 JTMS2
C9 DVDD   F10 DVDD   L12 MCLK2
C10 DVDD   F12 DVSS   L13 JTRST2
C11 DVDD   F13 RMSYNC2   M1 RRING1
C12 TNEGO2   G1 TVDD   M2 RVSS
C13 TCHCLK2   G2 DVDD   M3 RSIG1
C14 RLOS/LOTC2   G3 TCLKO3   M4 TCHBLK1
D1 TVSS   G6 RVSS   M8 RCHBLK4
D2 TVSS   G8 BPCLK2   M9 RSYNC4
M10 RFSYNC4   R5 DVSS   V6 RNEGO4
M11 TCLKO4   R6 DVSS   V7 RCHCLK4
N1 RTIP1   R7 TSERI4   V8 RLOS/LOTC4
N2 RVSS   R8 RVDD   V9 RMSYNC4
N3 RPOSO1   R9 RRING4   V10 DVSS
N4 RNEGO1   R10 RVSS   W1 TRING1
N5 DVSS   T1 TTIP1   W2 TVDD
N6 DVSS   T2 TVSS   W3 TSYNC1
N7 RCLK4   T3 DVSS   W4 TSSYNC1
N8 DVSS   T4 DVSS   W5 RCLK1
N9 TCLKT4   T5 DVSS   W6 CST
N10 TNEGO4   T6 DVSS   W7 TVSS
N11 TPOSO4   T7 RSERO4   W8 TTIP4
N13 TSSYNC4   T8 RVSS   W9 TRING4
P1 RVDD   T9 RTOP4   W10 TVDD
P2 RCHCLK1   T10 RVSS   Y1 RMSYNC1
P3 RCHBLK1   U1 TTIP1   Y2 RSYNC1
P4 TNEGO1   U2 TVSS   Y3 TCHCLK1
P5 DVSS   U4 TCLKT1   Y4 TSERI1
P6 TSYNC4   U5 DVSS   Y5 TSYSCLK4
P7 TSIG4   U6 DVSS   Y6 RSYSCLK4
P8 DVSS   U7 RPOSO4   Y7 TVSS
P9 JTCLK2   U8 RSIG4   Y8 TTIP4
P10 RCLKO4   U9 DVSS   Y9 TRING4
P11 TCHBLK4   U10 DVSS   Y10 TVDD
R1 RFSYNC1   V1 TRING1      
R2 RLOS/LOTC1   V2 TVDD      
R3 TPOSO1   V4 RCLKO1      
R4 TCLKO1   V5 TSIG1      
Table 3. Shared Device Pins for DS33Z41 and DS21458 Die
Pin Description   Pin Description   Pin Description
A16 WR/RW   C16 A9   E17 A6
A17 D1   C17 A7   E18 A4
A18 A5   C18 A2   F15 RD/DS
A19 A0   D16 D5   F16 D3
A20 A1   D17 A8   F17 D2
B15 D6   E7 MODEC[0]   G17 D0
B18 A3   E15 INT      
C15 D7   E16 D4      
Figure 1. DS33R41 400-ball BGA, color-coded pinout and die map.
More Detailed Image
(PDF, 237kB)
Figure 1. DS33R41 400-ball BGA, color-coded pinout and die map.

References

If you have additional questions on the JTAG testing of the DS33R41, please contact the Telecommunication Applications support team.
For more information about the DS33R41 Inverse-Multiplexing Ethernet Mapper with Integrated Quad Port T1/E1/J1 Transceiver, please consult the appropriate data sheet at: T/E Carrier and Packetized Communications.

Related Parts
DS33R41 Free Sample
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APP 4059:
APPLICATION NOTE 4059,AN4059, AN 4059, APP4059, Appnote4059, Appnote 4059