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参数资料
| 型号： | A3P-L67201V-55 |
| 厂商： | ATMEL WIRELESS MICROCONTROLLERS |
| 元件分类： | FIFO |
| 英文描述： | 512 X 9 OTHER FIFO, 55 ns, PDIP28 |
| 封装： | 0.300 INCH, PLASTIC, DIP-28 |
| 文件页数： | 13/16页 |
| 文件大小： | 146K |
| 代理商： | A3P-L67201V-55 |
L 67201/L 67202
MATRA MHS
Rev. C (10/11/95)
6
Table 1 : Reset and retransmit
Single Device Configuration/Width Expansion Mode
MODE
INPUTS
INTERNAL STATUS
OUTPUTS
MODE
RS
RT
XI
Read Pointer
Write Pointer
EF
FF
HF
Reset
0
X
0
Location Zero
0
1
Retransmit
1
0
Location Zero
Unchanged
X
Read/Write
1
0
Increment(4)
X
Note :
4. Pointer will increment if flag is high.
Table 2 : Reset and First Load Truth Table
Depth Expansion/Compound Expansion Mode
MODE
INPUTS
INTERNAL STATUS
OUTPUTS
MODE
RS
FL
XI
Read Pointer
Write Pointer
EF
FF
Reset First Device
0
(5)
Location Zero
0
1
Reset All Other Devices
0
1
(5)
Location Zero
0
1
Read/Write
1
X
(5)
X
Note :
5. XI is connected to XO of previous device.
See fig. 5.
Depth Expansion (Daisy Chain) Mode
The L 67201/202 can be easily adapted for applications
which require more than 512/1024 words. Figure 4
demonstrates Depth Expansion using three L 67201/202.
Any depth can be achieved by adding additional
67201/202.
The L 67201/202 operate in the Depth Expansion
configuration if the following conditions are met :
1. The first device must be designated by connecting the
First Load (FL) control input to ground.
2. All other devices must have FL in the high state.
3. The Expansion Out (XO) pin of each device must be
connected to the Expansion In (XI) pin of the next
device. See figure 4.
4. External logic is needed to generate a composite Full
Flag (FF) and Empty Flag (EF). This requires that all
EF’s and all FFs be Red (i.e. all must be set to
generate the correct composite FF or EF). See figure 4.
5. The Retransmit (RT) function and Half-Full Flag (HF)
are not available in the Depth Expansion Mode.
Compound Expansion Module
It is quite simple to apply the two expansion techniques
described above together to create large FIFO arrays (see
figure 5).
Bidirectional Mode
Applications which require data buffering between two
systems (each system being capable of Read and Write
operations) can be created by coupling L 67201/202 as
shown in figure 6. Care must be taken to ensure that the
appropriate flag is monitored by each system (i.e. FF is
monitored on the device on which W is in use ; EF is
monitored on the device on which R is in use). Both Depth
Expansion and Width Expansion may be used in this
mode.
Data Flow - Through Modes
Two types of flow-through modes are permitted : a read
flow-through and a write flow-through mode. In the read
flow-through mode (figure 17) the FIFO stack allows a
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