Motorola MPC823e Reference Manual page 416

Memory Controller
15.5.4.2.4 General-Purpose Signals. The general-purpose (GPL[1:5]) signals have two
bits in the RAM word that define the logical value of the signal to be changed at the falling
edge of GCLK1 or GCLK2. GPL0 has two 2-bit fields that perform the same function with
additional phase control. GPL5 and GPL0 offer the following enhancements beyond the
other GPLx signals:
• GPL5 can be controlled during phase 4 of the previous clock cycle according to the
value of G5LS.
CLKOUT/GCLK2
GCLK1
GPL5
TS
VALUE CONTROLLED
BY G5LS
4
CLOCK PHASE
• GPL0 can be controlled by an address line that is specified in the G0CLx field of the
MxMR. To use this feature, you must set the G0H and G0L fields in the RAM word. For
example, if you have a SIMM with multiple banks, this address line can be used to
switch between banks.
15-58
VALUE CONTROLLED
BY G5T4 AND G5T3 ON UPM
1 2 3 4
RAM WORD 1
Figure 15-30. Early GPL5 Control
MPC823e REFERENCE MANUAL
1
RAM WORD 2
MOTOROLA