GS8644Z18 ETC [List of Unclassifed Manufacturers], GS8644Z18 Datasheet - Page 25

• Manufacturer Part Number: GS8644Z18
• Description: 72Mb Pipelined and Flow Through Synchronous NBT SRAM
• Manufacturer: ETC [List of Unclassifed Manufacturers]

JTAG Port Operation
Overview
The JTAG Port on this RAM operates in a manner that is compliant with IEEE Standard 1149.1-1990, a serial boundary scan
interface standard (commonly referred to as JTAG). The JTAG Port input interface levels scale with V
drivers are powered by V
Disabling the JTAG Port
It is possible to use this device without utilizing the JTAG port. The port is reset at power-up and will remain inactive unless
clocked. TCK, TDI, and TMS are designed with internal pull-up circuits.To assure normal operation of the RAM with the JTAG
Port unused, TCK, TDI, and TMS may be left floating or tied to either V
Rev: 1.03 11/2004
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
A0–An
CKE
ADV
DQ
CK
Bn
E*
W
G
tS
tS
tS
tS
tS
tS
A
*Note: E = High(False) if E1 = 1 or E2 = 0 or E3 = 1
tH
tH
tH
tH
tH
tH
Write A
DDQ
.
tS
D(A)
B
Write B
tH
D(B)
Flow Through Mode Timing (NBT)
Write B+1
tKH
tKH
tKL
tKL
D(B+1)
C
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Read C
tLZ
tKQ
tKC
tKC
GS8644Z18(B/E)/GS8644Z36(B/E)/GS8644Z72(C)
Q(C)
Cont
tOHZ
DD
or V
D
Read D
SS
. TDO should be left unconnected.
tOLZ
tOE
E
Q(D)
Write E
tHZ
tKQX
F
D(E)
Read F
DD
tLZ
tKQ
. The JTAG output
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© 2003, GSI Technology
G
Q(F)
Write G
tKQX
D(G)