MATRA MHS
L 67201/L 67202
Functional Description
Operating Modes
L 67201/202 is in a Single Device Configuration when
the Expansion In (XI) control input is grounded (see
Single Device Mode
A single L 67201/202 may be used when the application Figure 2). In this mode the Half-Full Flag (HF), which is
requirements are for 512/1024 words or less. The 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)
L
67201
67202
(EF)
(RT)
EMPTY FLAG
RETRANSMIT
FULL FLAG (FF)
(RS)
RESET
EXPANSION IN (XI)
Status flags (EF, FF and HF) can be detected from any one
device. Figure 3 demonstrates an 18-bit word width by
Width Expansion Mode
Word width may be increased simply by connecting the using two L 67201/202. Any word width can be attained
corresponding input control signals of multiple devices. by adding additional L 67201/202.
Figure 3. Block Diagram of 512 / 1024 × 18 FIFO Memory Used in Width Expansion Mode.
HF
HF
18
9
9
DATA (I)
IN
(R) READ
(EF) EMPTY FLAG
(RT) RETRANSMIT
WRITE
(W)
L
L
FULL FLAG
RESET
(FF)
67201/202
67201/202
(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.
Rev. C (10/11/95)
5
TEMIC [ TEMIC SEMICONDUCTORS ]
