
5: PINS
S1D13505F00A HARDWARE FUNCTIONAL
EPSON
1-17
SPECIFICATION (X23A-A-001-12)
Memory Interface
Table 5-2 Memory Interface Pin Descriptions
Pin Name
Type
Pin #
Driver
Reset#
State
Description
LCAS#
O
51
CO1
1
For dual-CAS# DRAM, this is the column address strobe for the lower
byte (LCAS#).
For single-CAS# DRAM, this is the column address strobe (CAS#).
See “Table 5-8 Memory Interface Pin Mapping” for summary. See Mem-
ory Interface Timing for detailed functionality.
UCAS#
O
52
CO1
1
This is a multi-purpose pin:
For dual-CAS# DRAM, this is the column address strobe for the upper
byte (UCAS#).
For single-CAS# DRAM, this is the write enable signal for the upper
byte (UWE#).
See “Table 5-8 Memory Interface Pin Mapping” for summary. See Mem-
ory Interface Timing for detailed functionality.
WE#
O
53
CO1
1
For dual-CAS# DRAM, this is the write enable signal (WE#).
For single-CAS# DRAM, this is the write enable signal for the lower
byte (LWE#).
See “Table 5-8 Memory Interface Pin Mapping” for summary. See Mem-
ory Interface Timing for detailed functionality.
RAS#
O
54
CO1
1
Row address strobe - see Memory Interface Timing for detailed function-
ality.
MD[15:0]
IO
34, 36, 38,
40, 42, 44,
46, 48, 49,
47, 45, 43,
41, 39, 37,
35
C/TS1D
Hi-Z
Bi-Directional memory data bus.
During reset, these pins are inputs and their states at the rising edge of
RESET# are used to congure the chip - see Summary of Conguration
Options. Internal pull-down resistors (typical values of 100K
/180Κ
at 5V/3.3V respectively) pull the reset states to 0. External pull-up resis-
tors can be used to pull the reset states to 1.
See Memory Interface Timing for detailed functionality.
MA[8:0]
O
58, 60, 62,
64, 66, 67,
65, 63, 61
CO1
Output
Multiplexed memory address - see Memory Interface Timing for function-
ality.
MA9
IO
56
C/TS1
Output
This is a multi-purpose pin:
For 2M byte DRAM, this is memory address bit 9 (MA9).
For asymmetrical 512K byte DRAM, this is memory address bit 9
(MA9).
For symmetrical 512K byte DRAM, this pin can be used as general pur-
pose IO pin 3 (GPIO3).
Note that unless congured otherwise, this pin defaults to an input and
must be driven to a valid logic level.
See “Table 5-8 Memory Interface Pin Mapping” for summary. See Mem-
ory Interface Timing for detailed functionality.
MA10
IO
59
C/TS1
Output
This is a multi-purpose pin:
For asymmetrical 2M byte DRAM this is memory address bit 10
(MA10).
For symmetrical 2M byte DRAM and all 512K byte DRAM this pin can
be used as general purpose IO pin 1 (GPIO1).
Note that unless congured otherwise, this pin defaults to an input and
must be driven to a valid logic level.
See “Table 5-8 Memory Interface Pin Mapping” for summary. See Mem-
ory Interface Timing for detailed functionality.
MA11
IO
57
C/TS1
Output
This is a multi-purpose pin:
For asymmetrical 2M byte DRAM this is memory address bit 11
(MA11).
For symmetrical 2M byte DRAM and all 512K byte DRAM this pin can
be used as general purpose IO pin 2 (GPIO2).
Note that unless congured otherwise, this pin defaults to an input and
must be driven to a valid logic level.
See “Table 5-8 Memory Interface Pin Mapping” for summary. See Mem-
ory Interface Timing for detailed functionality.