
45
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72T2098/108/118/128 2.5V HIGH-SPEED TeraSync DDR/SDR FIFO 20-BIT/10-BIT CONFIGURATIONS
32K x 20/64K x 10, 64K x 20/128K x 10, 128K x 20/256K x 10, 256K x 20/512K x 10
Figure 25. Loading of Programmable Flag Registers (IDT Standard and FWFT Modes)
NOTE:
1. In SDR mode, X = 16 for the IDT72T2098, X = 17 for the IDT72T20108, X = 18 for the IDT72T20118, X = 19 for the IDT72T20128 for X10 mode. X = 15 for the IDT72T2098,
X = 16 for the IDT72T20108, X = 17 for the IDT72T20118, X = 18 for the IDT72T20128 for all other modes.
2. In DDR mode, X = 15 for the IDT72T2098, X = 16 for the IDT72T20108, X = 17 for the IDT72T20118, X = 18 for the IDT72T20128 for X10 to X10 mode. X = 14 for the IDT72T2098,
X = 15 for the IDT72T20108, X = 16 for the IDT72T20118, X = 17 for the IDT 72T20128 for all other modes.
SCLK
SEN
SI
5996 drw28
EMPTY OFFSET
FULL OFFSET
BIT X
(1)
t
SENS
t
SDS
t
SENH
BIT X
(1)
BIT 1
t
ENH
t
SDH
t
SCLK
t
SCKH
t
SCKL
BIT 1
Figure 26. Reading of Programmable Flag Registers (IDT Standard and FWFT Modes)
NOTE:
1. In SDR mode, X = 15 for the IDT72T2098, X = 17 for the IDT72T20108, X = 18 for the IDT72T20118, X = 19 for the IDT72T20128 for X10 mode. X = 15 for the IDT72T2098,
X = 16 for the IDT72T20108, X = 17 for the IDT20118, X = 18 for the IDT72T20128 for all other modes.
2. In DDR mode, X = 15 for the IDT72T2098, X = 16 for the IDT72T20108, X = 17 for the IDT72T20118, X = 18 for the IDT20128, for X10 to X10 mode. X = 14 for the IDT72T72098,
X = 15 for the IDT72T20108, X = 16 for the IDT72T20118, X = 17 for the IDT72T20128 for all other modes.
3. Offset register values are always read starting fromthe first location in the offset register upon initiating
SREN
.
SCLK
SREN
SO
5996 drw29
BIT 0
EMPTY OFFSET
FULL OFFSET
BIT X
(1)
t
SENS
t
SOA
t
SENH
BIT X
(1)
t
ENH
t
SOA
t
SCLK
t
SCKH
t
SCKL
BIT 0