CY7C0852V-150BBC Cypress Semiconductor Corp, CY7C0852V-150BBC Datasheet - Page 12

• Manufacturer Part Number: CY7C0852V-150BBC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C0852V-150BBC

• Density: 4Mb
• Access Time (max): 4ns
• Operating Supply Voltage (typ): 3.3V
• Package Type: BGA
• Operating Temp Range: 0C to 70C
• Supply Current: 450mA
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.465V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 172
• Word Size: 36b
• Lead Free Status / Rohs Status: Not Compliant

Document #: 38-06059 Rev. *D
IEEE 1149.1 Serial Boundary Scan (JTAG)
The CY7C0851V/CY7C0852V/CY7C0853V incorporates an
IEEE 1149.1 serial boundary scan test access port (TAP). The
TAP controller functions in a manner that does not conflict with
the operation of other devices using 1149.1-compliant TAPs.
The TAP operates using JEDEC standard 3.3V I/O logic levels.
It is composed of three input connections and one output
connection required by the test logic defined by the standard.
Disabling the JTAG Feature
It is possible to operate the CY7C0851V/CY7C0852V/
CY7C0853V without using the JTAG feature. To disable the
TAP controller, TCK must be tied LOW (V
clocking of the device. TDI and TMS are internally pulled up
and may be unconnected. They may alternatively be
connected to V
left unconnected.
Test Access Port–Test Clock (TCK)
The test clock is used only with the TAP controller. All inputs
are captured on the rising edge of TCK. All outputs are driven
from the falling edge of TCK.
Test Mode Select (TMS)
The TMS input is used to give commands to the TAP controller
and is sampled on the rising edge of TCK. It is allowable to
leave this pin unconnected if the TAP is not used. The pin is
pulled up internally, resulting in a logic HIGH level.
Test Data-In (TDI)
The TDI pin is used to serially input information into the
registers and can be connected to the input of any of the
Notes:
14. The “X” in this diagram represents the counter upper bits.
15. Boundary scan is IEEE 1149.1-compatible. See “Performing a Pause/Restart” for deviation from strict 1149.1 compliance.
DD
through a pull-up resistor. TDO should be
Example:
Load
Counter-Mask
Register = 3F
Load
Address
Counter = 8
Max + 1
Address
Register
Max
Address
Register
Figure 2. Programmable Counter-Mask Register Operation
CNTINT
H
H
L
H
SS
2
2
2
2
) to prevent
16
16
16
16
PRELIMINARY
X
0
X
X
2
2
2
2
15
15
15
15
X
0
X
X
[15]
Masked Address
Xs
0s
Xs
Xs
CY7C0851V/CY7C0852V/CY7C0853V
registers. The register between TDI and TDO is chosen by the
instruction that is loaded into the TAP instruction register. For
information on loading the instruction register, see the TAP
Controller State Diagram. TDI is internally pulled up and can
be unconnected if the TAP is unused in an application. TDI is
connected to the MSB on any register.
Test Data Out (TDO)
The TDO output pin is used to serially clock data out from the
registers. The output is active depending upon the current
state of the TAP state machine (see TAP Controller State
Diagram [FSM]). The output changes on the falling edge of
TCK. TDO is connected to the LSB of any register.
Performing a TAP Reset
A reset is performed by forcing TMS HIGH (V
edges of TCK. This reset does not affect the operation of the
CY7C0851V/CY7C0852V/CY7C0853V,
performed while the device is operating. An MRST must be
performed on the CY7C0851V/CY7C0852V/CY7C0853V
after power-up.
Performing a Pause/Restart
When a SHIFT-DR PAUSE-DR SHIFT-DR is performed the
scan chain will output the next bit in the chain twice. For
example, if the value expected from the chain is 1010101, the
device will output a 11010101. This extra bit will cause some
testers
CY7C0851V/CY7C0852V/CY7C0853V
Therefore the tester should be configured to never enter the
PAUSE-DR state.
2
2
2
2
6
6
6
6
to
X
0
X
X
2
2
2
2
5
5
5
5
0 0
1 1
0 0
1 1
report
Unmasked Address
2
2
2
2
4
4
4
4
2
2
2
2
3
CY7C0831V/CY7C0832V
3
3
3
1
1
1
1
2
2
2
2
2
an
2
2
2
0
1
0
1
[1, 14]
2
2
2
2
1
1
1
1
0
1
0
1
erroneous
2
2
2
2
0
0
0
0
0
1
0
1
Mask
Register
bit-0
Address
Counter
bit-0
in
failure
and
DD
a
Page 12 of 33
) for five rising
scan
may
for
test.
the
be