參數(shù)資料
型號(hào)： W28J321BB90L
廠商： WINBOND ELECTRONICS CORP
元件分類： PROM
英文描述： 2M X 16 FLASH 2.7V PROM, 90 ns, PBGA48
封裝： 8 X 11 MM, 0.75 MM PITCH, TFBGA-48
文件頁(yè)數(shù)： 44/47頁(yè)
文件大?。?/td> 1385K
代理商： W28J321BB90L
W28J321B/T
- 6 -
Block Organization
This product features an asymmetrically-blocked architecture providing system memory integration.
Each erase block can be erased independently of the others up to 100,000 times. For the address
locations of the blocks, see the memory map in Figure 3.
Boot Blocks: The boot block is intended to replace a dedicated boot PROM in a microprocessor or
microcontroller-based system. This boot block 4k words (4,096 words) features hardware controllable
write protection to protect the crucial microprocessor boot code from accidental modification. The
protection of the boot block is controlled using a combination of the VPP, #RESET, #WP pins and block
lock-bit.
Parameter Blocks: The boot block architecture includes parameter blocks to facilitate storage of
frequently update small parameters that would normally require an EEPROM. By using software
techniques, the word-rewrite functionality of EEPROMs can be emulated. Each boot block component
contains six parameter blocks of 4k words (4,096 words) each. The protection of the parameter block
is controlled using a combination of the VPP, #RESET and block lock-bit.
Main Blocks: The reminder is divided into main blocks for data or code storage. Each 32M-bit device
contains sixty-three 32k words (32,768 words) blocks. The protection of the main block is controlled
using a combination of the VPP, #RESET and block lock-bit.
5. PIN CONFIGURATION
A
#CE
A3
B
C
D
E
F
G
H
A4
A2
A1
A0
#OE
A7
A17
A6
A5
DQ0
DQ8
DQ9
DQ1
A18
A20
DQ2
DQ10
DQ11
DQ3
#WP
#WE
#RESET
NC
A19
DQ5
DQ12
V DD
DQ4
A9
A8
A10
A11
DQ7
DQ14
DQ13
DQ6
A13
A12
A14
A15
A16
DQ15
Vss
V DD
VPP
1
2
3
4
5
6
0.75mm pitch
48-Ball TFBGA
Pinout
8 x 11 mm
TOP VIEW
Figure 2. 0.75 mm pitch TFBGA 48-Ball Pinout
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