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| 型号： | MCM69C432TQ20 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC CAM 1MB 50MHZ 100LQFP |
| 标准包装： | 72 |
| 格式 - 存储器： | RAM |
| 存储器类型： | CAM |
| 存储容量： | 1M（16K x 64） |
| 速度： | 50MHz |
| 接口： | 并联 |
| 电源电压： | 3.135 V ~ 3.465 V |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 100-LQFP |
| 供应商设备封装： | 100-TQFP（14x20） |
| 包装： | 托盘 |
Freescale Semiconductor, Inc.
TEST ACCESS PORT DESCRIPTION
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N could also be used for this
instruction is selected. EXTEST I
purpose, but CLAMP shortens , the board scan path by insert-
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HIGH M TAP INSTRUCTION
S The HIGH–Z instruction is provided to allow all the outputs
INSTRUCTION SET
A 5–pin IEEE Standard 1149.1 Test Port (JTAG) is in-
cluded on this device. When the TAP (Test Access Port) con-
troller is in the SHIFT–IR state, the instruction register is
placed between TDI and TDO. In this state, the desired
instruction would be serially loaded through the TDI input.
TRST resets the TAP controller to the test–logic reset state.
The TAP instruction set for this device are as follows.
STANDARD INSTRUCTIONS
Code
Instruction (Binary) Description
BYPASS 1111* Bypass instruction
SAMPLE/PRELOAD 0010 Sample and/or preload
instruction
EXTEST 0000 Extest instruction
HIGHZ 1001 High–Z all output pins while
bypass register is between
TDI and TDO
CLAMP 1100 Clamp output pins while
bypass register is between
TDI and TDO
* Default state at power–up.
B
SAMPLE/PRELOAD TAP INSTRUCTION
The SAMPLE/PRELOAD TAP I instruction is used to allow
scanning of the boundary scan register without causing inter-
ference to the normal operation of the chip logic. The 62–bit
boundary scan register contains bits for all device signal and
clock pins and associated control signals. This register is ac-
cessible when the SAMPLE/PRELOAD TAP instruction is
loaded into the TAP instruction register in the SHIFT–IR
state. When the TAP controller is then moved to the SHIFT–
DR state, the boundary scan register is placed between TDI
and TDO. This scan register can then be used prior to the
EXTEST instruction to preload the output pins with desired
values so that these pins will drive the desired state when the
EXTEST instruction is loaded. As data is written into TDI,
data also streams out TDO which can be used to pre–sample
the inputs and outputs.
SAMPLE/PRELOAD would also be used prior to the
CLAMP instruction to preload the values on the output pins
that will be driven out when the CLAMP instruction is loaded.
EXTEST TAP INSTRUCTION
The EXTEST instruction is intended to be used in con-
junction with the SAMPLE/PRELOAD instruction to assist in
testing board level connectivity. Normally, the SAMPLE/
PRELOAD instruction would be used to preload all output
pins. The EXTEST instruction would then be loaded. During
EXTEST, the boundary scan register is placed between TDI
and TDO in the SHIFT–DR state of the TAP controller. Once
the EXTEST instruction is loaded, the TAP controller would
then be moved to the run–test/idle state. In this state, one
cycle of TCK would cause the preloaded data on the output
pins to be driven while the values on the input pins would be
sampled. Note the TCK, not the clock pin (CLK), is used as
the clock input while CLK is only sampled during EXTEST.
After one clock cycle of TCK, the TAP controller would then
be moved to the SHIFT–DR state where the sampled values
would be shifted out of TDO (and new values would be
shifted in TDI). These values would normally be compared to
expected values to test for board connectivity.
CLAMP TAP INSTRUCTION
The CLAMP instruction is provided to allow the state of the
signals driven from the output pins to be determined from the
boundary scan register while the bypass register is selected
as the serial path between TDI and TDO. The signals driven
from the output pins will not change while the CLAMP
R
ing only the bypass register between TDI and TDO. To use
CLAMP, the SAMPLE/PRELOAD instruction would be used
first to scan in the values that will be driven on the output pins
when the CLAMP instruction is active.
–Z
E to be placed in an inactive drive state (high–Z). During the
HIGH–Z instruction the bypass register is connected be-
tween TDI and TDO.
BYPASS TAP INSTRUCTION
The BYPASS instruction is the default instruction loaded at
power up. This instruction will place a single shift register
between TDI and TDO during the SHIFT–DR state of the
TAP controller. This allows the board level scan path to be
shortened to facilitate testing of other devices in the scan
path.
BOUNDARY SCAN REGISTER
The boundary scan register is identical in length to the
number of active input, output, and I/O connections on the
device (not counting the TAP pins). The boundary scan reg-
ister, under the control of the TAP controller, is loaded with
the contents of the RAM I/O ring when the controller is in
capture–DR state and then is placed between the TDI and
TDO pins when the controller is moved to shift–DR state.
Several TAP instructions can be used to activate the bound-
ary scan register.
The Bit Scan Order table (Table 2) describes which device
pin connects to each boundary scan register location. The
first column defines the bit’s position in the boundary scan
register. The shift register bit at G (i.e., first to be shifted out)
is defined as bit 1. The second column is the name of the pin,
third column is the pin number and the fourth column is the
pin type (input, output, or I/O).
DISABLING THE TEST ACCESS PORT AND
BOUNDARY SCAN
It is possible to use this device without utilizing the four
pins used for the test access port. To circuit disable the
device, TCK must be tied to V SS to preclude mid–level
inputs. Although TDI and TMS are designed in such a way
that an undriven input will produce a response equivalent to
the application of a logic 1, it is still advisable to tie these
inputs to VDD through a 1K resistor. TDO should remain
unconnected.
MCM69C432 ? SCM69C432
16
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA FAST SRAM
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