M67201A/M67202A
Functional Description
Operating Modes
The M 67201A/202A is in a Single Device Configuration
when the Expansion In (XI) control input is grounded (see
Single Device Mode
A single M 67201A/202A may be used when the Figure 2). In this mode the Half-Full Flag (HF), which is
application requirements are for 512/1024 words or less. an active low output, is shared with Expansion Out (XO).
Figure 2. Block Diagram of Single 512 × 9 and 1024 × 9.
HF
(HALF–FULL FLAG)
(W)
9
(R)
Q
READ
WRITE
9
DATA
DATA
OUT
IN
(I)
M
67201A
67202A
(EF)
(RT)
EMPTY FLAG
RETRANSMIT
FULL FLAG (FF)
(RS)
RESET
EXPANSION IN (XI)
Status flags (EF, FF and HF) can be detected from any
device. Figure 3 demonstrates an 18-bit word width by
WIDTH EXPANSION MODE
Word width may be increased simply by connecting the using two M 67201A/202A. Any word width can be
corresponding input control signals of multiple devices. attained by adding additional M 67201A/202A.
Figure 3. Block Diagram of 512 / 1024 × 18 FIFO Memory Used in Width Expansion Mode.
HF
HF
9
18
9
DATA (1)
IN
(R) READ
(EF) EMPTY FLAG
(RT) RETRANSMIT
WRITE
(W)
M
M
FULL FLAG
(FF)
67201A/202A
67201A/202A
RESET
(RS)
9
9
XI
XI
18
(Q)DATA
OUT
Note
:
3. Flag detection is accomplished by monitoring the FF, EF and the HF signals on either (any) device used in the width
expansion configuration. Do not connect any output control signals together.
MATRA MHS
5
Rev. D (11 April. 97)
TEMIC [ TEMIC SEMICONDUCTORS ]
