PPC60x Originated Latency Matrix | Motorola MVME2400 specs

3

Functional Description

PPC Bus Latency

The following tables list the latency of PPC originated transactions and the bandwidth of originated transactions for five different clock ratios: 5:2, 3:2, 3:1, 2:1, and 1:1. The MVME2400 uses a 3:1 clock ratio:

Table 3-5. PPC60x Originated Latency Matrix

			32-bit PCI							64-bit PCI					Clock
Transaction															Clock
Transaction	Beat	Beat		Beat		Beat	Total	Beat	Beat		Beat		Beat	Total	Ratio
	Beat	Beat		Beat		Beat	Total	Beat	Beat		Beat		Beat	Total	Ratio
	1	2		3		4		1	2		3		4


Burst Read	40	1		1		1	43	29	1		1		1	32	5:2

Burst Write	5	1		1		1	8	5	1		1		1	8

Single Read	22	-		-		-	22	-	-		-		-	-

Single Write	5	-		-		-	5	-	-		-		-	-

Burst Read	26	1		1		1	29	20	1		1		1	23	3:2

Burst Write	5	1		1		1	8	5	1		1		1	8

Single Read	16	-		-		-	16	-	-		-		-	-

Single Write	5	-		-		-	5	-	-		-		-	-

Burst Read	45	1		1		1	48	33	1		1		1	36	3:1

Burst Write	5	1		1		1	8	5	1		1		1	8

Single Read	24	-		-		-	24	-	-		-		-	-

Single Write	5	-		-		-	5	-	-		-		-	-

Burst Read	33	1		1		1	36	25	1		1		1	28	2:1

Burst Write	5	1		1		1	8	5	1		1		1	8

Single Read	19	-		-		-	19	-	-		-		-	-

Single Write	5	-		-		-	5	-	-		-		-	-

Burst Read	20	1		1		1	23	16	1		1		1	19	1:1

Burst Write	5	1		1		1	8	5	1		1		1	8

Single Read	13	-		-		-	13	-	-		-		-	-

Single Write	5	-		-		-	5	-	-		-		-	-

3-10	Computer Group Literature Center Web Site

Image 58

Motorola MVME2400 manual PPC60x Originated Latency Matrix, PPC Bus Latency