MPC2605ZP66R View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MPC2605ZP66R

Integrated Secondary Cache for PowerPC Microprocessors

Motorola => Freescale 

READ MISS (NORMAL BUS MODE)

Figure 3 is an illustration of MPC2605 pipeline depth with a

read miss followed by a read hit.

For illustration purposes the read miss is shown as a

3–1–1–1 response from memory. AACK for the second

access is not driven true until the cycle after the fourth TA of

the read miss. This is because the MPC2605 is not in control

of TA for the first access and must, therefore, wait until the

first access’ data tenure is complete before it can drive AACK

true for the read hit.

CLK

CPU BG

TS

A0 – A31

TBST

L2 CLAIM

AACK

CPU DBG

DBB

TA

DH0 – DH31,

DL0 – DL31

1

2

3

4

5

6

7

8

9

10

11

12

A

B

A1

A2

A3

A4

B1

B2

B3

B4

LEGEND

Signal driven to the MPC2605

Signal driven by the MPC2605

High–Z

Figure 3. Read Miss Followed by a Burst Read Hit for MPC603/604

MOTOROLA

MPC2605

17

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