MPC8280 datasheet(473/1386 Pages) FREESCALE

473 / 1386 page

Memory Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

11-53

11.5.1

Timing Configuration

If BRx[MS] selects the GPCM, the attributes for the memory cycle are taken from ORx. These attributes

include the CSNT, ACS[0–1], SCY[0–3], TRLX, EHTR, and SETA fields. Table 11-31 shows signal

behavior and system response.

Table 11-31. GPCM Strobe Signal Behavior

Option Register Attributes

Signal Behavior

TRLX Access ACS

CSNT

Address to CS

Asserted

CS Negated to

Address Change

WE Negated to

Address/Data Invalid

Total Cycles

0Read

2+SCY1

1 SCY is the number of wait cycles from the option register.

Read

1/4*Clock

2+SCY

Read

1/2*Clock

2+SCY

Write

2+SCY

Write

1/4*Clock

2+SCY

Write

1/2*Clock

2+SCY

Write

-1/4*Clock

2+SCY

Write

1/4*Clock

-1/4*Clock

2+SCY

Write

1/2*Clock

-1/4*Clock

2+SCY

1Read

2+2*SCY

Read

(1+1/4)*Clock

3+2*SCY

Read

(1+1/2)*Clock

3+2*SCY

Write

2+2*SCY

Write

(1+1/4)*Clock

3+2*SCY

Write

(1+1/2)*Clock

3+2*SCY

Write

-1-1/4*Clock

3+2*SCY

Write

(1+1/4)*Clock

-1-1/4*Clock

4+2*SCY

Write

(1+1/2)*Clock

-1-1/4*Clock

4+2*SCY

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