2-6 System Board
J Class Technical Reference
Test Access Port (TAP)
The CPU module supports the IEEE 1149 standard. Please refer to Table 2–6 for a summary of the Test
Access Port signals. These signals are routed to the modules system interface to assist in manufacturing
testability.
Table 2–6. Test Access Port (TAP) Signal Summary
Signal
Signal Count
Direction
Comments
TCK
1
Input
Test clock
TMS
1
Input
Test Mode Select
TDI
1
Input
Test Data In
TDO
1
Output
Test Data Out
TRESET
1
Input
Reset Tap
Module Configuration Status
The CPU module is able to identify its cache size, operating frequency, and processor operating voltage
requirements. The clock frequency status ensures that a module is not installed in a system with a system
clock frequency that is incompatible with the module. Please refer to Tables 2.11, 2.12, 2.13, and 2.14 for
a further description of the configuration status byte.
Table 2–7. Module Configuration Status Byte
Status [0:7]
0
1
2
3
4
5
6
7
Cache Configuration
Operating Frequency
Operating Voltage
Status[0:5] are supplied to the Processor Dependent Hardware (PDH). PDH is able to detect the presence
or absence of a CPU module in a slot by reading the first two status bits of the module. Each of the bits is
pulled high through a resistor on the system board. The CPU module ties the bits that should be logic zero
to ground through a 0 ohm resistor.
Table 2–8. Cache Configuration Bits
Status[0:2]
Cache Size - Bytes
0
1
2
I Cache
D Cache
0
0
0
64K
64K
0
0
1
256K
256K
0
1
0
1M
1M
0
1
1
Reserved-J200 and
J210
Reserved-J200 and
J210
0
1
1
512K-J210XC
512K-J210XC
1
0
x
Reserved
Reserved
1
1
x
No CPU present
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