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IBM13N32644JCA
IBM13N32734JCA
32M x 64/72 Two-Bank Unbuffered SDRAM Module
Features
• Programmable Operation:
• 168-Pin Unbuffered 8-Byte Dual In-Line Memory
Module
- CAS Latency: 2, 3
• 32Mx64/72 Synchronous DRAM DIMM
• Two speed sorts:
- Burst Type: Sequential or Interleave
- Burst Length: 1, 2, 4, 8, Full-Page (Full-
Page supports Sequential burst only)
- Operation: Burst Read and Write or Multiple
Burst Read with Single Write
• -260 and -360 for PC100 applications
• Inputs and outputs are LVTTL (3.3V) compatible
• Single 3.3V ± 0.3V Power Supply
• Single Pulsed RAS interface
• Suspend Mode and Power Down Mode
• 12/10/2 Addressing (Row/Column/Bank)
• 4096 Refresh cycles distributed across 64ms
• Serial Presence Detect
• Card size: 5.25" x 1.375" x 0.158" max
• Gold contacts
• SDRAMs in TSOP Type II Package
• SDRAMs have 4 internal banks
• Module has 2 physical banks
• Fully Synchronous to positive Clock Edge
• Data Mask for Byte Read/Write control
• Auto Refresh (CBR) and Self Refresh
• Automatic and controlled Precharge commands
Description
IBM13N32644JCA / IBM13N32734JCA are unbuf-
fered 168-pin Synchronous DRAM Dual In-Line
Memory Modules (DIMMs) which are organized as
32Mx64 and 32Mx72 high-speed memory arrays
and are configured as two 16Mx64/72 physical
banks. The DIMMs use sixteen (32Mx64) or eigh-
teen (32Mx72) 16Mx8 SDRAMs in 400mil TSOP II
packages. The DIMMs achieve high-speed data-
transfer rates of up to 100MHz by employing a
prefetch/pipeline hybrid architecture that supports
the JEDEC 1N rule while allowing very low burst
power.
CAS, WE, S0-S3, DQMB, and CKE0-CKE1 signals.
A command decoder initiates the necessary timings
for each operation. A 14-bit address bus accepts
address information in a row/column multiplexing
arrangement.
Prior to any Access operation, the CAS latency,
burst type, burst length, and burst operation type
must be programmed into the DIMM by address
inputs A0-A9 during the Mode Register Set cycle.
The DIMM uses serial presence detects imple-
mented via a serial EEPROM using the two pin IIC
protocol. The first 128 bytes of serial PD data are
used by the DIMM manufacturer. The last 128 bytes
are available to the customer.
The -260 and -360 speed sort DIMMs are compati-
ble with the Intel PC100 SDRAM unbuffered DIMM
specification.
All IBM 168-pin DIMMs provide a high-performance,
flexible 8-byte interface in a 5.25” long space-saving
footprint. Related products include both EDO DRAM
and SDRAM unbuffered DIMMs in both non-parity
x64 and ECC-Optimized x72 configurations.
All control, address, and data input/output circuits
are synchronized with the positive edge of the exter-
nally supplied clock inputs.
All inputs are sampled at the positive edge of each
externally supplied clock (CK0 - CK3). Internal oper-
ating modes are defined by combinations of RAS,
Card Outline
(Front)
(Back)
10 11
94 95
84
1
40 41
124 125
168
85
09K3540.F38351
8/99
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
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