參數(shù)資料
型號(hào)： μPD481850
廠商： NEC Corp.
英文描述： Synchronous Graphics Memory (SGRAM)(8M 同步圖形存儲(chǔ)器)
中文描述： 同步圖形存儲(chǔ)器（SGRAM）（8分同步圖形存儲(chǔ)器）
文件頁數(shù)： 1/94頁
文件大?。?/td> 1180K
代理商： ΜPD481850
MOS INTEGRATED CIRCUIT
μ
PD481850
for Rev.L
8 M-BIT SYNCHRONOUS GRAM
128K-WORD BY 32-BIT BY 2-BANK
Document No.
Date Published
Printed in Japan
M12052EJ4V0DS00 (4th edition)
September 1997 NS
PRELIMINARY DATA SHEET
NEC Corporation 1996
The information in this document is subject to change without notice.
The mark
shows major revised points.
Description
The
μ
PD481850 is a synchronous graphics memory (SGRAM) organized as 131,072 words
×
32 bits
×
2 banks
random access port.
This device can operate up to 100 MHz by using synchronous interface. Also, it has 8-column Block Write
function to improve capability in graphics system.
This product is packaged in 100-pin plastic QFP (14
×
20 mm).
Features
131,072 words
×
32 bits
×
2 banks memory
Synchronous interface (Fully synchronous DRAM with all input signals are latched at rising edge of clock)
: Pulsed interface
: Automatic precharge and controlled precharge commands
: Ping-pong operation between the two internal memory banks
: Up to 100 MHz operation frequency
Possible to assert random column address in every cycle
Dual internal banks controlled by A9 (Bank Address: BA)
Byte control using DQM0 to DQM3 signals both in read and write cycle
8-column Block Write (BW) function
Persistent write per bit (WPB) function
Wrap sequence : Sequential / Interleave
Programmable burst length (1, 2, 4, 8 and full page)
Programmable /CAS latency (2 and 3)
Power Down operation and Clock Suspend operation
Auto refresh (CBR refresh) or self refresh capability
Single 3.3 V
±
0.3 V power supply
LVTTL compatible inputs and outputs
100-pin Plastic QFP (14
×
20 mm)
1,024 refresh cycles/16 ms
Burst termination by Precharge command
Burst termination by Burst stop command (in case of full page burst)
Ordering Information
Part number
Cycle time
Clock frequency
Package
ns (MIN.)
MHz (MAX.)
μ
PD481850GF-A10-JBT
10
100
100-pin Plastic QFP (14
×
20 mm)
μ
PD481850GF-A12-JBT
12
83
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