Rev. 2.00, 09/03, page 19 of 690
Classification
Symbol
I/O
Name
Function
CS0
,
CS2
to
CS4
,
CS5A
,
CS5B
,
CS6A
,
CS6B
,
O
Chip select 0,
2 to 4, 5A, 5B,
6A, 6B
Chip-select signal for external
memory or devices.
RD
O
Read
Indicates reading of data from
external devices.
RD/
WR
O
Read/write
Read/write signal.
BS
O
Bus start
Bus-cycle start.
WE3
O
Highest-byte
write
Indicates that bits 31 to 24 of the
data in the external memory or
device are being written.
WE2
O
Second-highest-
byte write
Indicates that bits 23 to 16 of the
data in the external memory or
device are being written.
WE1
O
Second-lowest-
byte write
Indicates that bits 15 to 8 of the
data in the external memory or
device are being written.
WE0
O
Lowest-byte
write
Indicates that bits 7 to 0 of the data
in the external memory or device
are being written.
CKE
O
CK enable
Clock enable. (SDRAM)
DQMUU
O
DQ mask UU
Selects D31 to D24. (SDRAM)
DQMUL
O
DQ mask UL
Selects D23 to D16. (SDRAM)
DQMLU
O
DQ mask LU
Selects D15 to D8. (SDRAM)
DQMLL
O
DQ mask LL
Selects D7 to D0. (SDRAM)
RASU
O
Row address U Specifies a row address. (SDRAM)
RASL
O
Row address L
Specifies a row address. (SDRAM)
CASU
O
Column address
U
Specifies a column address.
(SDRAM)
CASL
O
Column address
L
Specifies a column address.
(SDRAM)
AH
O
Address hold
Address hold signal.
Bus control
WAIT
I
Wait
Inserts a wait cycle into the bus
cycles during access to the
external space.
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