IBM PowerPC 750GX, User Manual

Page: 258 / 377

User’s Manual
IBM PowerPC 750GX and 750GL RISC Microprocessor
Signal Descriptions
Page 258 of 377
gx_07.fm.(1.2)
March 27, 2006
7.2.4.2 Transfer Size (TSIZ[0–2])—Output
eieio Address only 1 0 0 0 0 N/A
External control word write Single-beat write 1 0 1 0 0 N/A
TLB Invalidate Address only 1 1 0 0 0 N/A
External control word read Single-beat read 1 1 1 0 0 N/A
lwarx
reservation set
Address only 0 0 0 0 1 N/A
Reserved — 0 0 1 0 1 N/A
tlbsync Address only 0 1 0 0 1 N/A
icbi Address only 0 1 1 0 1 N/A
Reserved — 1 X X 0 1 N/A
Write-with-flush Single-beat write or burst 0 0 0 1 0
Flush, cancel reserva-
tion
Write-with-kill Single-beat write or burst 0 0 1 1 0 Kill, cancel reservation
Read Single-beat read or burst 0 1 0 1 0 Clean or flush
Read-with-intent-to-modify Burst 0 1 1 1 0 Flush
Write-with-flush-atomic Single-beat write 1 0 0 1 0
Flush, cancel reserva-
tion
Reserved N/A 1 0 1 1 0 N/A
Read-atomic Single-beat read or burst 1 1 0 1 0 Clean or flush
Read-with-intent-to modify-atomic Burst 1 1 1 1 0 Flush
Reserved — 0 0 0 1 1 N/A
Reserved — 0 0 1 1 1 N/A
Read-with-no-intent-to-cache Single-beat read or burst 0 1 0 1 1 Clean
Reserved — 0 1 1 1 1 N/A
Reserved — 1 X X 1 1 N/A
State Asserted/
Negated For memory accesses, these signals, along with the transfer burst (TBST)
signal, indicate the data-transfer size for the current bus operation, as shown
in Table 7-3 on page 259. Table 8-4 on page 296 shows how the transfer
size signals are used with the address signals for aligned transfers.
Table 8-5 on page 298 shows how the transfer size signals are used with the
address signals for misaligned transfers.
For external control instructions (eciwx and ecowx), TSIZ[0–2] are used to
output bits 29–31 of the External Access Register (EAR), which are used to
form the resource ID (TBST||TSIZ0–TSIZ2).
Table 7-2. PowerPC 750GX Snoop Hit Response
(Page 2 of 2)
60x Bus Specification Command Transaction TT0 TT1 TT2 TT3 TT4
PowerPC 750GX Bus
Snooper;
Action on Hit