Graphic RAM. VG4616322B Datasheet

VG4616322B RAM. Datasheet pdf. Equivalent


Part VG4616322B
Description CMOS Synchronous Graphic RAM
Feature VIS Overview Preliminary VG4616321B/VG4616322B 262,144x32x2-Bit CMOS Synchronous Graphic RAM The .
Manufacture Vanguard International Semiconductor
Datasheet
Download VG4616322B Datasheet


VIS Overview Preliminary VG4616321B/VG4616322B 262,144x32x VG4616322B Datasheet
Recommendation Recommendation Datasheet VG4616322B Datasheet




VG4616322B
VIS
Overview
Preliminary
VG4616321B/VG4616322B
262,144x32x2-Bit
CMOS Synchronous Graphic RAM
The VG4616321(2) SGRAM is a high-speed CMOS synchronous graphics RAM containing 16M bits. It
is internally configured as a dual 256K x 32 DRAM with a synchronous interface (all signals are registered on
the positive edge of the clock signal, CLK). Each of the 256K x 32 bit banks is organized as 1024 rows by
256 columns by 32 bits. Read and write accesses to the SGRAM are burst oriented; accesses start at a
selected location and continue for a programmed number of locations in a programmed sequence. Accesses
begin with the registration of a BankActivate command which is then followed by a Read or Write command.
The VG4616321(2) provides for programmable Read or Write burst lengths of 1, 2, 4, 8, or full page,
with burst termination option. An Auto Precharge function may be enabled to provide a self-timed row pre-
charge that is initiated at the end of the burst sequence. The refresh functions, either Auto or Self Refresh
are easy to use. In addition, it features the write per bit and the masked block write functions.
By having a programmable Mode register and special mode register, the system can choose the best
suitable modes to maximize its performance. These devices are well suited for applications requiring high
memory bandwidth, and when combined with special graphics functions result in a device particularly well
suited to high performance graphics applications.
Features
• Fast access time from clock: 4.5/5/5.5ns
• Fast clock rate: 200/166/143 MHz
• Fully synchronous operation
• Internal pipelined architecture
• Dual internal banks(256K x 32-bit x 2-bank)
• Programmable Mode and Special Mode registers
- CAS Latency: 1, 2, or 3
- Burst Length: 1, 2, 4, 8, or full page
- Burst Type: interleaved or linear burst
- Burst Read Single Write
- Load Color or Mask register
• Burst stop function
• Individual byte controlled by DQM0-3
• Block write and write-per-bit capability
• Auto Refresh and Self Refresh
• 2048 refresh cycles/32ms
• Single + 3.3V ±0.3V power supply
• Input Reference Voltage : Vref = 1.5V ± 0.2V
• Interface: LVTTL and SSTL_3
• JEDEC 100-pin Plastic QFP package
Document:1G5-0145
Rev.1
Page 1



VG4616322B
VIS
Preliminary
VG4616321B/VG4616322B
262,144x32x2-Bit
CMOS Synchronous Graphic RAM
DQ3
VDDQ
DQ4
DQ5
VSSQ
DQ6
DQ7
VDDQ
DQ16
DQ17
VSSQ
DQ18
DQ19
VDDQ
VDD
VSS
DQ20
DQ21
VSSQ
DQ22
DQ23
VDDQ
DQM0
DQM2
WE
CAS
RAS
CS
BS
A8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
80 DQ28
79 VDDQ
78 DQ27
77 DQ26
76
75
VSSQ
74 DQ24
73
72
VDDQ
DQ15
71 DQ14
70 VSSQ
69 DQ13
68 DQ12
67 VDDQ
66 VSS
65 VDD
64 DQ11
63 DQ10
62
61
VSSQ
DQ9
60 DQ8
59 VDDQ
58 NC/Vref
57 DQM3
56 DQM1
55 CLK
54 CKE
53 DSF
52 NC
51 A9
Key Specifications
VG4616321/VG4616322
tCK Clock Cycle time(min.)
tRAS
Row Active time(min.)
tAC Access time from CLK(max.)
tRC Row Cycle time(min.)
-5/6/7
5/6/7 ns
30/36/40 ns
4.5/5/5.5 ns
45/54/62 ns
Document:1G5-0145
Rev.1
Page 2







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