HIGH-SPEED 2.5V
PRELIMINARY
IDT70T651/9S
256/128K x 36
ASYNCHRONOUS DUAL-PORT
STATIC RAM
WITH 3.3V 0R 2.5V INTERFACE
◆
Busy and Interrupt Flags
On-chip port arbitration logic
Features
◆
◆
True Dual-Port memory cells which allow simultaneous
◆
Full on-chip hardware support of semaphore signaling
between ports
Fully asynchronous operation from either port
Separate byte controls for multiplexed bus and bus
matching compatibility
access of the same memory location
High-speed access
◆
◆
◆
– Commercial:8/10/12/15ns(max.)
– Industrial: 10/12ns(max.)
◆
RapidWrite Mode simplifies high-speed consecutive write
◆
◆
◆
◆
Sleep Mode Inputs on both ports
cycles
◆
Supports JTAG features compliant to IEEE 1149.1
Single 2.5V (±100mV) power supply for core
LVTTL-compatible, selectable 3.3V (±150mV)/2.5V (±100mV)
power supply for I/Os and control signals on each port
Available in a 256-ball Ball Grid Array, 208-pin Plastic Quad
Flatpack and 208-ball fine pitch Ball Grid Array.
Industrial temperature range (–40°C to +85°C) is available
for selected speeds
Dual chip enables allow for depth expansion without
external logic
◆
IDT70T651/9 easily expands data bus width to 72 bits or
more using the Master/Slave select when cascading more
than one device
◆
◆
◆
M/S = VIH for BUSY output flag on Master,
M/S = VIL for BUSY input on Slave
Functional Block Diagram
BE3L
BE3R
BE2R
BE2L
BE1L
BE0L
BE1R
BE0R
R/WL
R/WR
B B B B
E E E E
B
E
3
B B B
E E E
2 1 0
0
1
2
3
CE0L
CE1L
CE0R
CE1R
L
L
L
L
R R R R
OEL
OER
Dout0-8_L
Dout9-17_L
Dout18-26_L
Dout27-35_L
Dout0-8_R
Dout9-17_R
Dout18-26_R
Dout27-35_R
256/128K x 36
MEMORY
ARRAY
I/O0L- I/O35L
Di n_L
Di n_R
I/O0R -I/O35R
(1)
A
17R
0R
(1)
17L
Address
Decoder
A
Address
Decoder
ADDR_L
ADDR_R
A
A0L
CE0L
CE1L
ARBITRATION
CE0R
CE1R
TDI
TC K
TMS
TRST
JTAG
INTERRUPT
SEMAPHORE
LOGIC
TD O
OE
L
OE
R
R/WL
R/W
R
(2,3)
(3)
(2,3)
R
BUSY
L
BUSY
SEM
M/S
SEM
L
R
(3)
INT
L
INT
R
ZZ
(4)
(4)
ZZR
ZZL
CONTROL
LOGIC
NOTES:
1. Address A17x is a NC for IDT70T659.
2. BUSY is an input as a Slave (M/S=VIL) and an output when it is a Master (M/S=VIH).
3. BUSY and INT are non-tri-state totem-pole outputs (push-pull).
4869 drw 01
4. The sleep mode pin shuts off all dynamic inputs, except JTAG inputs, when asserted. OPTx, INTx, M/S and the sleep
mode pins themselves (ZZx) are not affected during sleep mode.
NOVEMBER 2003
1
DSC-5632/3
©2003IntegratedDeviceTechnology,Inc.