MPC2105A データシートの表示（PDF） - Motorola => Freescale

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MPC2105A

512KB and 1MB BurstRAM™ Secondary Cache Modules for PowerPC™ PReP/CHRP Platforms

Motorola => Freescale 

TAG RAM MATCH CYCLE

Parameter

Clock High Write to MATCH Invalid

Clock High Read to MATCH Valid

Address Valid to MATCH Valid

MATCH Valid Hold from Address Change

TG Low to MATCH Invalid

TG High to MATCH Valid

TAG RAM RESET (TCLR) CYCLE

Parameter

TCLR Setup Time

TCLR Hold Time

Status Bit Reset Time

Status Bit Hold from TCLR Low

TCLR Low to MATCH Invalid

TCLR High to MATCH Valid

TCLR Low to TAG High–Z

TCLR High to TAG Active

STANDBY Setup to TCLR Low

TCLR High to TWE Low

Symbol

tKHML

tKHMV

tAVMV

tAXMX

tGLML

tGHMX

Symbol

tSTC

tHTC

tSRST

tSHRS

tRSML

tRSMV

tRSQZ

tRSQX

tPDSR

tRHWX

Tag RAM

Min

Max

Unit

—

7

ns

—

10

ns

—

10

ns

2

—

ns

—

7

ns

—

8

ns

Tag RAM

Min

Max

Unit

4

—

ns

1

—

ns

—

60

ns

2

—

ns

—

10

ns

—

100

ns

—

10

ns

—

100

ns

30

—

ns

80

—

ns

OUTPUT

Z0 = 50 Ω

50 Ω

VL = 1.5 V

OUTPUT

255 Ω

+5 V

480 Ω

5 pF

(a)

(b)

Figure 1. Test Loads

TIMING LIMITS

The table of timing values shows either a

minimum or a maximum limit for each param-

eter. Input requirements are specified from

the external system point of view. Thus, ad-

dress setup time is shown as a minimum

since the system must supply at least that

much time. On the other hand, responses

from the memory are specified from the de-

vice point of view. Thus, the access time is

shown as a maximum since the device never

provides data later than that time.

MPC2105A•MPC2106A•MPC2105B•MPC2106B

14

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