Rainbow Electronics W9864G2GH - Manual (Page 5)

W9864G2GH
Publication Release Date: August 16 ,2006
- 5 - Revision A01
5. PIN DESCRIPTION
PIN NUMBER PIN NAME FUNCTION DESCRIPTION
24, 25, 26, 27, 60, 61, 62, 63,
64, 65, 66
A0 −A10 Address
Multiplexed pins for row and column address.
Row address: A0
−A10. Column address: A0−A7.
A10 is sampled during a precharge command to
determine if all banks are to be precharged or
bank selected by BS0, BS1.
22, 23 BS0, BS1 Bank Select
Select bank to activate during row address latch
time, or bank to read/write during address latch
time.
2, 4, 5, 7, 8, 10, 11, 13, 31, 33,
34, 36, 37, 39, 40, 42, 45, 47,
48, 50, 51, 53, 54, 56, 74, 76,
77, 79, 80, 82, 83, 85
DQ0 −
DQ31
Data Input/
Output
Multiplexed pins for data output and input.
20 CS Chip Select
Disable or enable the command decoder. When
command decoder is disabled, new command is
ignored and previous operation continues.
19 RAS
Row Address
Strobe
Command input. When sampled at the rising
edge of the clock RAS , CAS and WE
define the operation to be executed.
18 CAS
Column Address
Strobe
Referred to RAS
17 WE Write Enable Referred to RAS
16, 28, 59, 71
DQM0 −
DQM3
Input/Output
Mask
The output buffer is placed at Hi-Z (with latency
of 2) when DQM is sampled high in read cycle.
In write cycle, sampling DQM high will block the
write operation with zero latency.
68 CLK Clock Inputs
System clock used to sample inputs on the rising
edge of clock.
67 CKE Clock Enable
CKE controls the clock activation and
deactivation. When CKE is low, Power Down
mode, Suspend mode, or Self Refresh mode is
entered.
1, 15, 29, 43 V CC Power
Power for input buffers and logic circuit inside
DRAM.
44, 58, 72, 86 V SS Ground
Ground for input buffers and logic circuit inside
DRAM.
3, 9, 35, 41, 49, 55, 75, 81 V CCQ
Power for I/O
Buffer Separated power from VCC, to improve DQ
noise immunity.
6, 12, 32, 38, 46, 52, 78, 84 V SSQ
Ground for I/O
Buffer Separated ground from VSS, to improve DQ
noise immunity.
14, 21, 30, 57, 69, 70, 73 NC No Connection
No connection.(The NC pin must connect to
ground or floating.)