5962D9317708VTC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
5962D9317708VTC Datasheet PDF : 20 Pages
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M67206H
Table 1. Reset and Retransmit
Single Device Configuration/Width Expansion Mode
Inputs
Internal Status
Mode
RS
RT
XI Read Pointer
Write Pointer
Reset
0
X
0 Location Zero
Location Zero
Retransmit
1
0
0 Location Zero
Unchanged
Read/Write
1
1
0
Increment(1)
Increment(1)
Note: 1. Pointer will increment if flag is high.
Table 2. Reset and First Load Truth Table
Depth Expansion/Compound Expansion Mode
Inputs
Internal Status
Mode
RS
FL
XI Read Pointer
Write Pointer
Reset First Device
0
0
(1) Location Zero
Location Zero
Reset All Other
Devices
0
1
(1) Location Zero
Location Zero
Read/Write
1
X
(1) X
X
Outputs
EF
FF
HF
0
1
1
X
X
X
X
X
X
Outputs
EF
FF
0
1
0
1
X
X
Note: 1. XI is connected to XO of previous device.
See Figure 4.
Depth Expansion (Daisy
Chain) Mode
The M67206H can be easily adapted for applications which require more than 16384
words. Figure 4 demonstrates Depth Expansion using three M67206Hs. Any depth can
be achieved by adding an additional M67206H.
The M67206H operates 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 ORed (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 cre-
ate large FIFO arrays (see Figure 5).
7
4143J–AERO–04/07
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