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HTF16C64_128_256x64AG.fm - Rev. D 5/06 EN
5 ©2003 Micron Technology, Inc. All rights reserved.
512MB, 1GB, 2GB: (x64, DR) 240-Pin DDR2 SDRAM UDIMM
Pin Assignments and Descriptions
120 SCL Input
Serial clock for presence-detect: SCL is used to synchronize the
presence-detect data transfer to and from the module.
101, 239, 240 SA0–SA2 Input
Presence-detect address inputs: These pins are used to configure
the presence-detect device.
3, 4, 9, 10, 12, 13, 21, 22, 24,
25, 30, 31, 33, 34, 39, 40, 80,
81, 86, 87, 89, 90, 95, 96, 98,
99, 107, 108, 110, 111, 116,
117, 122, 123, 128, 129, 131,
132, 140, 141, 143, 144, 149,
150, 152, 153, 158, 159, 199,
200, 205, 206, 208, 209, 214,
215, 217, 218, 226, 227, 229,
230, 235, 236
DQ0–DQ63 I/O
Data Input/output: Bidirectional data bus.
6, 7, 15, 16, 27, 28, 36, 37,
83, 84, 92, 93, 104, 105, 113,
114,
DQS0–DQS7,
DQS0#–DQS7#
I/O
Data strobe: Output with read data, input with write data for
source synchronous operation. Edge-aligned with read data,
center aligned with write data. DQS# is only used when
differential data strobe mode is enabled via the LOAD MODE
command.
119 SDA I/O
Serial presence-detect data: SDA is a bidirectional pin used to
transfer addresses and data into and out of the presence-detect
portion of the module.
53, 59, 64, 67, 69, 172, 178,
184, 187, 189, 197,
V
DD Supply
Power supply: +1.8V ±0.1V.
51, 56, 62, 72, 75, 78, 170,
175, 181, 191, 194,
V
DDQ Supply
DQ Power supply: +1.8V ±0.1V.
1V
REF Supply
SSTL_18 reference voltage.
2, 5, 8, 11, 14, 17, 20, 23, 26,
29, 32, 35, 38, 41, 44, 47, 50,
65, 66, 79, 82, 85, 88, 91, 94,
97,100, 103, 106, 109,112,
115, 118, 121, 124, 127, 130,
133, 136, 139, 142, 145, 148,
151, 154, 157, 160, 163, 166,
169, 198, 201, 204, 207, 210,
213, 216, 219, 222, 225, 228,
231, 234, 237
V
SS Supply
Ground.
238 V
DDSPD Supply
Serial EEPROM positive power supply: +1.7V to +3.6V.
18, 19, 42, 43, 45, 46, 48, 49,
54 (512MB, 1GB), 55, 68, 76,
102, 125, 126, 134, 135, 146,
147, 155, 156, 161, 162, 164,
165, 167, 168, 171, 173, 174,
196 (512MB), 202, 203, 211,
212, 223, 224, 232, 233
NC –
No connect: These pins should be left unconnected.
Table 5: Pin Descriptions
Pin numbers may not correlate with symbols; refer to Table 4 on page 3 for more information
Pin Numbers Symbol Type Description