
STD110
5-84
SEC ASIC
FIFO_HD
High-Density Synchronous First-In First-Out Memory
FIFO_HD Function Table
NOTES:
1.
2.
3.
4.
5.
Read is blocked when REN is high and the read port is in disable mode.
Read is blocked when EF is high (overread protection).
Under that OEN is high, DOUT[] goes to tri-state output mode.
Write is blocked when WEN is high and the write port is in disable mode.
Write is blocked when FF is high (overwrite protection).
Parameter Description
FIFO_HD is the compiler that automatically generates symbol, netlist, timing model, power model and layout
according to the following parameters; Number of words(w), Number of bit per word(b) and Column mux(y).
RST
↓
H
H
H
H
WEN
X
X
X
L
X
WCK
X
X
X
↑
X
REN
X
X
L
X
L
RCK
X
X
↑
X
↑
RTM
X
↓
H
X
H
OEN
X
X
L
X
L
EF
↑
↓
L
↓
↑
FF
↓
X
↓
L
L
DI
X
X
X
DOUT
L
L
DOUT(t)
DOUT(t-1)
DOUT(t)
COMMENT
Reset mode
Retransmit mode
Read mode
Write mode
Read and Empty
mode
Write and Full
mode
Note 1
Note 2
Note 3
Note 4
Note 5
valid
X
H
L
↑
X
X
X
X
L
↑
valid
DOUT(t-1)
H
H
X
H
H
X
X
X
H
L
X
X
X
↑
↑
H
L
X
X
X
↑
↑
X
X
X
H
H
X
X
X
L
L
H
X
X
X
H
X
X
X
X
X
X
X
H
X
X
X
DOUT(t-1)
DOUT(t-1)
Hi-Z
DOUT(t-1)
DOUT(t-1)
valid
valid
Parameters
YMUX = 4
32
512
32
2
64
1
YMUX = 8
64
1024
64
2
32
1
YMUX = 16
128
2048
128
2
16
1
YMUX = 32
256
4096
256
2
8
1
Words (w)
Min
Max
Step
Min
Max
Step
Bpw (b)