參數(shù)資料
型號: IDT72521L35JB
廠商: Integrated Device Technology, Inc.
英文描述: PARALLEL BIDIRECTIONAL FIFO 512 x 18 & 1024 x 18
中文描述: 雙向并行FIFO的512 × 18
文件頁數(shù): 11/28頁
文件大?。?/td> 434K
代理商: IDT72521L35JB
IDT72511/IDT72521
BIDIRECTIONAL FIRST-IN FIRST-OUT MEMORY
MILITARY AND COMMERCIAL TEMPERATURE RANGES
5.32
11
Bit
0
Function
Select Port B Interface
R
B
and
W
B
or
DS
B
and R/
W
B
0
1
Pins are
R
B
and
W
B
(Intel-style interface)
Pins are
DS
B
and R/
W
B
(Motorola-style interface)
1
Unused
2
Full Flag Definition
0
1
0
Write pointer meets read pointer
Write pointer meets reread pointer
Read pointer meets write pointer
3
Empty Flag Definition
1
0
1
Read pointer meets rewrite pointer
REQ pin active HIGH
REQ pin active LOW
4
REQ Pin Polarity
5
ACK Pin Polarity
0
1
00
01
ACK pin active LOW
ACK pin active HIGH
2 internal clocks between REQ assertion and ACK assertion
3 internal clocks between REQ assertion and ACK assertion
7-6
REQ / ACK Timing
10
11
0
4 internal clocks between REQ assertion and ACK assertion
5 internal clocks between REQ assertion and ACK assertion
R
B
,
W
B
, and
DS
B
are asserted for 1 internal clock
R
B
,
W
B
, and
DS
B
are asserted for 2 internal clocks
Internal clock = CLK
Internal clock = CLK divided by 2
Processor interface mode (Port B controls are inputs)
8
Port B Read & Write
Timing Control for Peripheral Mode
1
0
1
0
9
Internal Clock
Frequency Control
10
Port B Interface
Mode Control
1
Peripheral interface mode (Port B controls are outputs)
11
12
Unused
Unused
13
14
15
Unused
Unused
Unused
CONFIGURATION REGISTER 5 FORMAT
15
6
5
4
3
2
1
0
Unused
PIO5
PIO4
PIO3
PIO2
PIO1
PIO0
2668 tbl 13
Figure 4. BiFIFO Configuration Register 6 Format for Programmable I/O Data
CONFIGURATION REGISTER 7 FORMAT
2668 tbl 14
Figure 5. BiFIFO Configuration Register 7 Format for Programmable I/O Direction Mask
Unused
MIO5
MIO4
MIO3
MIO2
MIO1
MIO0
15
6
5
4
3
2
1
0
2668 tbl 12
Table 10. BiFIFO Configuration Register 5 Format
CONFIGURATION REGISTER 6 FORMAT
相關(guān)PDF資料
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