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JTAG/ONCE Interface Cable

Motorola Host Computer Card and Command Converter Support Information 4-3

4.2 Host Computer Interface Cable

The 37-pin cable which connects to the host computer is called the host computer interface

cable. This cable provides the signals and power to the command converters.

4.3 JTAG/O

CE Interface Cable

The command converter 14-pin connector is connected to the target system through the

JTAG/OnCE interface cable. These signals provide the control signals to as many as 24

target DSPs or other JTAG devices.

Table 4-3. Host Computer Interface Cable

Pin # Mnemonic Signal Name and Description

1 INT_ACK Host ack of ADM service request

2 ADM_GROUP CC group control flag from Host

3 HOST_ACK Host ack of ADM data transfer request

4 ADM_ALL Host signal which selects all ADMs

5 ADM_RESET Host signal which asserts CC(s) reset

6-8 ADM_SEL2,1,0 CC address select signals 2-0 for one of 8 CCs

9 HOST_REQ Host signal which requests CC data

10 ADM_REQ CC signal which requests Host data transfer

11 ADM_ACK CC ack of Host data transfer request

12 ADM_INT CC service request status signal to Host

13 HOST_BRK

CC service request signal to Host, (low true)

14 ADM_BRK Host signal to interrupt CC(s)

15 BRACE_SEL Brace56 Emulator select signal

16-19 PD1,3,5,7 HOST/CC data bus bits1, 3, 5, 7

20-25 GND HOST/CC ground lines

26 NC No Connect

27-29 +5v +5 volts from the HOST

30 HOST_ENABLE HOST signal which enables CC address logic

31-33 GND HOST/CC ground lines

34-37 PD0,2,4,6 HOST/CC data bus bits 0, 2, 4, 6

Table 4-4. JTAG/OnCE Connector J2

Pin # Signal Signal Description

1 TDI/DSI Target JTAG/OnCE Serial Input

2 GND Ground

3 TDO/DSO Target JTAG/OnCE Serial Output

4 GND Ground

5 TCK/DSCK Target JTAG/OnCE Serial Clock

6 GND Ground

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 69 70

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Motorola Command One Manuel d'utilisateur Page 45