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1745D–ATARM–04-Nov-05
AT91M55800A
11.2 EBI Pin Description
The following table shows how certain EBI signals are multiplexed:
Name Description Type
A0 - A23 Address bus (output) Output
D0 - D15 Data bus (input/output) I/O
NCS0 - NCS7 Active low chip selects (output) Output
NRD Read Enable (output) Output
NWR0 - NWR1 Lower and upper write enable (output) Output
NOE Output enable (output) Output
NWE Write enable (output) Output
NUB, NLB Upper and lower byte-select (output) Output
NWAIT Wait request (input) Input
Multiplexed Signals Functions
A0 NLB 8- or 16-bit data bus
NRD NOE Byte-write or byte-select access
NWR0 NWE Byte-write or byte-select access
NWR1 NUB Byte-write or byte-select access