User`s manual

Chip Errata
DSP56305 Digital Signal Processor
Mask: 0F13S
DSP56305 Errata  1996 - 2002 Motorola pg. 15 /ng/12/20/02
ES53
Description (added 9/25/1997):
Using the JTAG instruction code 1111 ($F) or 1101 ($D) for the BYPASS
instruction may cause the chip to enter Debug mode (which then
correctly sets the Status bits (OS[1:0]) in the OnCE Status and Control
Register (OSCR[7:6]) and asserts the DE output to acknowledge the
Debug mode status).
Workaround:
Use one of the following alternatives:
a. If possible, do not use instruction code 1111 ($F) or 1101 ($D) for the
BYPASS instruction. Use one of the other defined BYPASS instruction
codes (i.e., any code from 1000–1100 ($8–$C) or 1110 ($E)).
b. If you must use instruction code 1111 ($F) or 1101 ($D), use the
following procedure:
— While the $F or $D instruction code is in the Instruction Register,
ensure that the JTAG Test Access Port (TAP) state machine does not
pass through the JTAG Test-Logic-Reset state while accessing any
JTAG registers (i.e., Instruction Register, Boundary Scan Register, or
ID Register).
— Before using any other JTAG instruction, load one of the other
BYPASS instruction codes (i.e., any code from 1000–1100 ($8–$C) or
1110 ($E)) into the instruction register. Then, any other JTAG
instruction may be used.
0F13S
Errata
Number
Errata Description
Applies
to Mask