MMC2107 Datasheet, PDF (505/618 Pages) –

Freescale Semiconductor, Inc.
External Bus Interface Module (EBI)
Signal Descriptions
The EBI also drives the address, size, and read/write pins during internal
data transfers, but the output enable and byte enable pins are not
asserted. To see the internal data bus on the external pins, show cycles
must be enabled.
Only internal sources can terminate internal data transfers. Chip-select
channels, external TA assertion, and external TEA assertion cannot
terminate internal data transfers.
19.3 Signal Descriptions
Table 19-1 provides an overview of the signal properties which are
discussed in this subsection.
Name
D[31:0]
SHS
TA
TEA
CSE[1:0]
TC[2:0]
R/W
A[22:0]
EB[3:0]
CS[3:0]
OE
TSIZ[1:0]
PSTAT[3:0]
Table 19-1. Signal Properties
Port
PA, PB, PC, PD
PE7
PE6
PE5
PE[4:3]
PE[2:0]
PF7
PF[6:0], PG, PH
PI[7:4]
PI[3:0]
—
—
—
Function
Data bus
Show cycle strobe
Transfer acknowledge
Transfer error acknowledge
Emulation chip selects
Transfer code
Read/write
Address bus
Enable byte
Chip selects
Output enable
Transfer size
Processor status
Pullup
—
Active
Active
Active
Active
Active
Active
Active
Active
Active
—
—
—
MMC2107 – Rev. 2.0
MOTOROLA
External Bus Interface Module (EBI)
For More Information On This Product,
Go to: www.freescale.com
Technical Data
505