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LF4415

Video Memory / FIFO

LUXPIA 

Address Control

PRELIMINARY

LF4460

LF4430

LF4415

Video Memory / FIFO

FRAME

MEMORY

5 Figure 7 - Write Address Pointer Control

[1]

RESET WCLK WEN WCLR WSET RDWR ADDR D11-0 PrevAdd Addr. Description

0

X

X

X

X

X

X

X

0000 Master reset - write/read pointers are cleared

1

0

1

1

X

X

D1 0000 0001 Increment write pointer - write D1 to addr. 1

1

0

0

1

X

X

D2 0001 0000 Clear write pointer - write D2 to addr. 0

1

0

1

1

X

X

D3 0000 0001 Increment write pointer - write D3 to addr. 1

1

1

1

1

X

X

XXX 0001 0001 Halt write pointer - no write operation

1

1

1

1

X

X

XXX 0001 0001 Halt write pointer - no write operation

1

0

1

1

X

X

D4 0001 0002 Increment write pointer - write D4 to addr 2

1

0

1

1

X

X

FFF 0002 0003 Increment write pointer - write FFF to addr 3 (begin EAV/SAV)

1

0

1

1

X

X

000 0003 0004 Increment write pointer - write 000 to addr 4

1

0

1

1

X

X

000 0004 0005 Increment write pointer - write 000 to addr 5

1

0

1

1

X

X

XYZ 0005 0006 Increment write pointer - write XYZ to addr 6

1

0

1

1

X

X

D5

0006

[2]

0004 Write pointer cleared (assuming falling F-bit detected - Register 9[7])

1

0

1

1

X

X

D6 0004 0005 Increment write pointer - write D6 to addr. 1

1

0

1

0

0

An

D7 0005

An Ext. Addr. Port address override - write D7 to addr. “An” **

1

0

1

0

0

Am D8 An

Am Ext. Addr. Port address override - write D8 to addr. “Am” **

1

0

1

1

X

X

D9

Am Am+1 Increment write pointer - write D9 to addr “Am+1”

NOTES:

1. Overriding the Write address is only possible during Single-Channel modes. Holding WSET0 LOW for multiple cycles allows multi-cycle or ‘full-time’ Write address override

- with the address capable of changing every cycle

2. Upon detecting a falling F-bit in the TRS preamble (assuming Register 9[7] is set), the write pointer is cleared - with the beginning of the TRS preamble referenced to

address zero. The ‘FFF’ word is written to address 0000, the first ‘000’ word is written to address 0001, etc. The first active sample is therefore written to address 0004.

LOGIC Devices Incorporated

www.logicdevices.com

15

High Performance Memory Product

January 23, 2008 LDS-44xx-A

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