MMC2107 - Freescale Semiconductor

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.
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Freescale Semiconductor, I
19.3 Signal Descriptions
Table 19-1 provides an overview of the signal properties which are
discussed in this subsection.
Table 19-1. Signal Properties
Name Port Function Pullup
D[31:0] PA, PB, PC, PD Data bus —
SHS PE7 Show cycle strobe Active
TA PE6 Transfer acknowledge Active
TEA PE5 Transfer error acknowledge Active
CSE[1:0] PE[4:3] Emulation chip selects Active
TC[2:0] PE[2:0] Transfer code Active
R/W PF7 Read/write Active
A[22:0] PF[6:0], PG, PH Address bus Active
EB[3:0] PI[7:4] Enable byte Active
CS[3:0] PI[3:0] Chip selects Active
OE — Output enable —
TSIZ[1:0] — Transfer size —
PSTAT[3:0] — Processor status —
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA External Bus Interface Module (EBI) 505
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