AN2866 Freescale Semiconductor / Motorola, AN2866 Datasheet - Page 9

• Manufacturer Part Number: AN2866
• Description: Migrating from the MC68332 to the ColdFire MCF523x
• Manufacturer: Freescale Semiconductor / Motorola

Bus Arbitration
Freescale Semiconductor
Chip Selects
Controller
Interface
External
Memory
SDRAM
Module
Table 1. MC68332/MCF523x External Signal Comparison (continued)
MC68332 Signal
DSACK[1:0]
DSACK[1:0]
CSBOOT
Migrating from the MC68332 to the ColdFire
CS[10:0]
SIZ[1:0]
BGACK
A[23:0]
D[15:0]
BERR
RMC
R/W
BG
AS
DS
BR
—
—
—
—
—
—
—
—
—
MCF523x Signal
SD_CS[1:0]
SD_SRAS
SD_SCAS
TSIZ[1:0]
SD_CKE
D[31:16]
SD_WE
BS[3:0]
CS[7:1]
A[23:0]
D[15:0]
TEA
R/W
CS0
OE
TIP
TS
TA
—
—
—
—
—
—
®
MCF523x, Rev. 1.0
A[23:21] are muxed with CS[6:4] on the
MCF523x; Please note that the
MCF523x does not support E clock
functionality, which is used for
M6800-Type peripheral support.
These pins can be used as GPIOs on
the MCF523x if a 32-bit data bus is not
needed.
During bus transfers, external
devices can drive these signals to
indicate port width.
These signals are active even if the
bus transfer is to or from a
peripheral that is using one of the
chipselects
to terminate the bus cycle.
muxing with SD_CS?
Comment
Device Differences
9