lf4415 LOGIC Devices Inc., lf4415 Datasheet - Page 16

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

NOTES:
1. Overriding the Read address is only possible in Single-Channel modes. Holding RSET LOW for multiple cycles allows multi-cycle or ‘full-time’ Read address override
- with the address capable of changing every cycle
2. An additional 8 rising RCLK edges are required for the Memory contents to appear on Qx[11:0]
LOGIC Devices Incorporated
RESET RCLK REN
Figure 8 - Read Address Pointer Control
0
1
1
1
1
1
1
1
1
1
X
0
1
0
0
0
0
0
0
--
Address Control
RCLR RSET RDWRB ADDR PrevAdd IntAdd Description
www.logicdevices.com
X
1
1
1
1
1
1
1
0
1
X
1
1
1
1
0
0
1
1
1
X
X
X
X
X
X
X
X
1
1
[1]
Am
An
X
X
X
X
X
X
X
X
Am+1
0000
0000
0001
0001
0002
0000
Am
An
X
16
Am+1
0000
0000
0001
0001
0002
0000
Am
An
1
Master reset - write/read pointers are clearedMaster reset
REN pipelined by 1 RCLK cycle
Increment read pointer - read from addr 1
Halt read pointer - no output register update- no read operation
Increment read pointer - read from addr 2
Override read pointer to Ext. Addr. Port - read from addr. An
Override read pointer to Ext. Addr. Port - read from addr. Am
Increment read pointer - read from addr Am+1
Clear read pointer - read from addr 0
Increment read pointer - read from addr 1
PRELIMINARY
[2]
High Performance Memory Product
Video Memory / FIFO
MEMORY
FRAME
January 23, 2008 LDS-44xx-A
LF4460
LF4430
LF4415