mt90520 Zarlink Semiconductor, mt90520 Datasheet - Page 107

• Manufacturer Part Number: mt90520
• Description: 8-port Primary Rate Circuit Emulation Aal1 Sar
• Manufacturer: Zarlink Semiconductor

4.8.2
The JTAG device ID for the MT90520 is 1052814Bh:
Note that by mistake, two Zarlink products (MT90520 and MT90528) have been coded with the same Part Number
into the JTAG Device ID Register.
4.8.3
The TAP Controller of the MT90520 supports the following instructions: IDCODE, BYPASS, EXTEST, SAMPLE,
HIGHZ, CLAMP.
4.8.4
A BSDL (Boundary Scan Description Language) file is available from Zarlink Semiconductor to aid in the use of the
IEEE 1149 test interface.
JTAG ID
Boundary Scan Instructions
BSDL
TRST: Test Reset; asynchronous, active-low, input which is used to reset the JTAG interface, and the
TAP controller. The TRST pin has an internal pull-down, and should also be pulled LOW externally
whenever boundary-scan is not in use, to ensure normal operation of the MT90520. Figure 44 below
shows a typical board-level design, including how TRST can be pulled HIGH by the test connector in
cases where the tester does not provide a TRST pin.
Version<31:28>:
Part Number<27:12>:
Manufacturer ID<11:1>: 0001 0100 101
LSB<0>:
JTAG Tester
Signals
TCLK
GND
TDO
TMS
TDI
JTAG Test
Connector
Figure 44 - A Typical JTAG Test Connection
0001
0000 0101 0010 1000 = 0528h
1
Zarlink Semiconductor Inc.
MT90520
107
TCLK
TDI
TDO
TMS
TRST
MT90520
Board-Under-Test
Data Sheet