PACE 1757 M/ME

Page 14 of 34

Document # MICRO-10 REV B

RDYD TIMING

Notes:

1. The last two instructions executed during system test are: XIO RA, 1F44, 0 and JC 7, 0000 hex, 0. After execution of the

IOW bus cycle, the

XIO proceeds by filling the instruction pipe with two memory read bus cycles where the opcode 7070 hex and 0000 hex are entered to the

processor. As from the end of

STRBD in the second cycle, TEST END is asserted. At this point, the execution of IC starts by first issuing two

fetch cycles from the "old PC" (from addresses XXXX & XXXX +1). The data will be taken from system memory (because TEST END is

asserted) but both the address and data are irrelevant. Following that, IC will start filling the pipe from address 0000 hex and 0001 hex, now

from the system memory to start user's program execution.

2. All time measurements on active signals relate to 1.5V levels.