Cypress CY7C1166V18 - Manual (Page 12)

CY7C1166V18, CY7C1177V18
CY7C1168V18, CY7C1170V18
Document Number: 001-06620 Rev. *D Page 12 of 27
IEEE 1149.1 Serial Boundary Scan (JTAG)
These SRAMs incorporate a serial boundary scan test access
port (TAP) in the FBGA package. This part is fully compliant with
IEEE Standard #1149.1-2001. The TAP operates using JEDEC
standard 1.8V IO logic levels.
Disabling the JTAG Feature
It is possible to operate the SRAM without using the JTAG
feature. To disable the TAP controller, TCK must be tied LOW
(V
SS
) to prevent clocking of the device. TDI and TMS are inter-
nally pulled up and may be unconnected. They may alternately
be connected to V
DD
through a pull up resistor. TDO must be left
unconnected. Upon power up, the device comes up in a reset
state which does not interfere with the operation of the device.
Test Access Port—Test Clock
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
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 connect to the input of any of the registers. The register
between TDI and TDO is chosen by the instruction that is loaded
into the TAP instruction register. For more information about
loading the instruction register, see
“TAP Controller State
Diagram” on page 14. TDI is internally pulled up and uncon-
nected if the TAP is not used in an application. TDI is connected
to the most significant bit (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
“Instruction Codes” on page 17).
The output changes on the falling edge of TCK. TDO is
connected to the least significant bit (LSb) of any register.
Performing a TAP Reset
A Reset is performed by forcing TMS HIGH (V
DD
) for five rising
edges of TCK. This RESET does not affect the operation of the
SRAM and may be performed while the SRAM is operating. At
power up, the TAP is reset internally to ensure that TDO comes
up in a high-Z state.
TAP Registers
Registers are connected between the TDI and TDO pins and
enable data to be scanned into and out of the SRAM test circuitry.
Select only one register at a time through the instruction
registers. Data is serially loaded into the TDI pin on the rising
edge of TCK. Data is output on the TDO pin on the falling edge
of TCK.
Instruction Register
Load three-bit instructions serially into the instruction register.
This register is loaded when it is placed between the TDI and
TDO pins as shown in
“TAP Controller Block Diagram” on
page 15. Upon power up, the instruction register is loaded with
the IDCODE instruction. It is also loaded with the IDCODE
instruction if the controller is placed in a reset state as described
in the previous section.
When the TAP controller is in the Capture IR state, the two least
significant bits are loaded with a binary “01” pattern to allow fault
isolation of the board level serial test path.
Bypass Register
To save time when serially shifting data through registers, it is
sometimes advantageous to skip certain chips. The bypass
register is a single-bit register that can be placed between TDI
and TDO pins. This enables data to be shifted through the SRAM
with minimal delay. The bypass register is set LOW (V
SS
) when
the BYPASS instruction is executed.
Boundary Scan Register
The boundary scan register is connected to all of the input and
output pins on the SRAM. Several no connect (NC) pins are also
included in the scan register to reserve pins for higher density
devices.
The boundary scan register is loaded with the contents of the
RAM Input and Output ring when the TAP controller is in the
Capture-DR state and is then placed between the TDI and TDO
pins when the controller is moved to the Shift-DR state. Use the
EXTEST, SAMPLE/PRELOAD, and SAMPLE Z instructions to
capture the contents of the input and output ring.
The “Boundary Scan Order” on page 18 show the order in which
the bits are connected. Each bit corresponds to one of the bumps
on the SRAM package. The MSb of the register is connected to
TDI, and the LSb is connected to TDO.
Identification (ID) Register
The ID register is loaded with a vendor-specific 32-bit code
during the Capture-DR state when the IDCODE command is
loaded in the instruction register. The IDCODE is hardwired into
the SRAM and can be shifted out when the TAP controller is in
the Shift-DR state. The ID register has a vendor code and other
information described in the
“Identification Register Definitions”
on page 17 .
TAP Instruction Set
Eight different instructions are possible with the three-bit
instruction register. All combinations are listed in the
“Instruction
Codes” on page 17. Three of these instructions are listed as
RESERVED and must not be used. The other five instructions
are described in this section.
Instructions are loaded into the TAP controller during the Shift-IR
state when the instruction register is placed between TDI and
TDO. During this state, instructions are shifted through the
instruction register through the TDI and TDO pins. To execute
the instruction after it is shifted in, the TAP controller must be
moved into the Update-IR state.
[+] Feedback [+] Feedback