参数资料
型号: IDT72T1845L5BBI
厂商: IDT, Integrated Device Technology Inc
文件页数: 44/55页
文件大小: 0K
描述: IC FIFO 2048X18 2.5V 5NS 144BGA
标准包装: 1
系列: 72T
功能: 异步,双端口
存储容量: 36.8K(2K x 18)
数据速率: 10MHz
访问时间: 5ns
电源电压: 2.375 V ~ 2.625 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 144-BGA
供应商设备封装: 144-PBGA(13x13)
包装: 托盘
其它名称: 72T1845L5BBI
49
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72T1845/55/65/75/85/95/105/115/125 2.5V TeraSync 18-BIT/9-BIT FIFO 2Kx18/4Kx9, 4Kx18/
8Kx9, 8Kx18/16Kx9, 16Kx18/32Kx9, 32Kx18/64Kx9, 64Kx18/128Kx9, 128Kx18/256Kx9, 256Kx18/512Kx9, 512Kx18/1Mx9
FEBRUARY 10, 2009
Qn
O/P
Reg.
tA
tREF
OR
5909 drw33
tRCSLZ
REN
tENS
tENH
RCS
tENS
RCLK
a
b
c
d
e
f
g
h
i
Wn+1
WCLK
WEN
D0 - Dn
tSKEW1
tENS
tDS
tENH
Wn+2
Wn+3
ERCLK
EREN
tCLKEN
Wn+1
Wn+2
Wn+3
tA
tREF
Wn+1
Wn+2
Wn+3
tA
Wn Last Word
tA
tDH
tDS
1
2
tERCLK
HIGH-Z
Figure 29. Echo RCLK and Echo
REN
REN Operation (FWFT Mode Only)
NOTE:
1. The O/P Register is the internal output register. Its contents are available on the Qn output bus only when
RCS and OE are both active, LOW, that is the bus is not in High-
Impedance state.
2.
OE is LOW.
Cycle:
a&b. At this point the FIFO is empty,
OR is HIGH.
RCS and REN are both disabled, the output bus is High-Impedance.
c.
Word Wn+1 falls through to the output register,
OR goes active, LOW.
RCS is HIGH, therefore the Qn outputs are High-Impedance. EREN goes LOW to indicate that a new word has been placed on the output register.
d.
EREN goes HIGH, no new word has been placed on the output register on this cycle.
e.
No Operation.
f.
RCS is LOW on this cycle, therefore the Qn outputs go to Low-Impedance and the contents of the output register (Wn+1) are made available.
NOTE: In FWFT mode is important to take
RCS active LOW at least one cycle ahead of REN, this ensures the word (Wn+1) currently in the output register is made
available for at least one cycle.
g.
REN goes active LOW, this reads out the second word, Wn+2.
EREN goes active LOW to indicate a new word has been placed into the output register.
h.
Word Wn+3 is read out,
EREN remains active, LOW indicating a new word has been read out.
NOTE: Wn+3 is the last word in the FIFO.
i.
This is the next enabled read after the last word, Wn+3 has been read out.
OR flag goes HIGH and EREN goes HIGH to indicate that there is no new word available.
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