IBM 750GL, 750GX 7.2.4.2 Transfer Size (TSIZ[0–2])—Output

User’s Manual

IBM PowerPC 750GX and 750GL RISC Microprocessor

Table 7-2. PowerPC 750GX Snoop Hit Response (Page 2 of 2)

							PowerPC 750GX Bus
60x Bus Specification Command	Transaction	TT0	TT1	TT2	TT3	TT4	Snooper;
							Action on Hit
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	Address only	0	0	0	0	1	N/A
reservation set
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

7.2.4.2 Transfer Size (TSIZ[0–2])—Output

State	Asserted/	For memory accesses, these signals, along with the transfer burst (TBST)
	Negated	signal, indicate the data-transfer size for the current bus operation, as shown
		in Table 7-3on page 259. Table 8-4on page 296 shows how the transfer
		size signals are used with the address signals for aligned transfers.
		Table 8-5on 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 (TBSTTSIZ0–TSIZ2).

Signal Descriptions	gx_07.fm.(1.2)
Page 258 of 377	March 27, 2006