![](http://datasheet.mmic.net.cn/180000/HM66WP18513BP-65_datasheet_11307903/HM66WP18513BP-65_7.png)
HM66WP18513, HM66WP36257
Rev.0.3, Mar. 2002, page 7 of 31
Detailed Pin Description
Pin number(s)
LQFP
BGA
Symbol
Type Description
35, 34, 33, 32,
44, 45, 46, 47,
48, 49, 50, 81,
82, 83, 99, 100
37, 36
2A, 2C, 2R, 3A,
3B, 3C, 3T, 4G,
5A, 5B, 5C, 5T,
6A, 6C, 6R
4P, 4N
A
(
× 36-bit
× 18-bit
common)
A0,A1
Input Synchronous address inputs: These inputs are
registered and must meet setup and hold times
around the rising edge of CLK
. Burst address inputs
80
2T, 6T
4T
A (
× 18-bit)
A (
× 36-bit)
93, 94,
95, 96
5L, 5G,
3G, 3L
BWa, BWb
BWc, BWd
(
× 36-bit)
Input Synchronous byte write enables: These active LOW
inputs allow individual bytes to be written and must
meet the setup and hold times around the rising edge
of CLK. A byte write enable is LOW for a WRITE
cycle and HIGH for a READ cycle.
BWa controls
DQa0 to DQa8.
BWb controls DQb0 to DQb8. BWc
controls DQc0 to DQc8.
BWd controls DQd0 to
DQd8. Data I/O are tri-stated if any of these four
inputs are LOW.
93, 94
5L, 3G
BWa, BWb
(
× 18-bit)
87
4M
CEN
Input Synchronous clock enable: This active LOW internal
clock signal is active.
88
4H
WE
Input Synchronous write enable: This active LOW input
permits write operations and must meet the setup and
hold times around the rising edge of CLK.
89
4K
CLK
Input Clock: This signal latches the address, data, chip
enables, byte write enables and burst control inputs
on its rising edge. All synchronous inputs must meet
setup and hold times around the clock's rising edge.
98
4E
CE1
Input Synchronous chip enables: This active LOW input is
used to enable the device. This input is sampled only
when a external address is loaded. This input can be
used for memory depth expansion.
92
6B
CE3
Input
97
2B
CE2
Input Synchronous chip enable: This active HIGH input is
used to enable the device. This input sampled only
when a new external address is load. This input can
be used for memory depth expansion.
86
4F
OE
Input Output enable: This active LOW asynchronous input
enables the data I/O output drivers.
85
4B
ADV/
LD
Input Synchronous address advance or load control: This
active HIGH input is used to advance the internal
burst counter, controlling burst access after the
external address is loaded. A LOW input is caused a
new external address to be latched.