lf4415 LOGIC Devices Inc., lf4415 Datasheet - Page 26

• Manufacturer Part Number: lf4415
• Description: Video Memory / Fifo
• Manufacturer: LOGIC Devices Inc.

D[11:0]
WCLK
D[11:0]
Q[11:0]
Figure 10 - Write Cycle Timing - Write Enable
Figure 12 - Read Cycle Timing
Figure 11 - Write Cycle Timing - Write Masking
WCLK
WIEN
COLLIDE
RCLK
WEN
REN
LOGIC Devices Incorporated
PE
OE = LOW
WEN = LOW
NOTE: While bringing WIEN HIGH disables writes into memory, the write pointer continues to increment if WEN is LOW
NOTE: WIEN = LOW
(n–2)
t
PWH
t
t
PWH
PWH
t
D
t
t
CYC1
CYC2
t
t
t
t
CYC1
CYC2
CYC1
CYC2
t
PWL
t
t
PWL
PWL
t
t
(n–1)
(n)
(n)
t
www.logicdevices.com
t
DH
DH
(n+1)
(n+1)
(n)
t
t
WES
t
WES
RES
data not
data o
written
w
(n+2)
(
(
t i r
e t
2)
)
n
26
data not
data o
written
w
(n+3)
(
(
t i r
(n+2)
e t
3)
)
n
t
t
WEH
WEH
t
REH
PRELIMINARY
(n+4)
(n+2)
High Performance Memory Product
t
F
t
D
(n+5)
(n+3)
(n+3)
Video Memory / FIFO
t
F
January 23, 2008 LDS-44xx-A
FRAME
MEMORY
(n+6)
(n+4)
(n+3)
LF4460
LF4430
LF4415