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Description of the Command Codes
3-18
4) The master sends 0x03 to the MSP53C691 as the level 1 parameter to in-
dicate the test mode.
Most Significant
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
0
0
0
1
1
Level 1 parameter sent
5) The MSP53C691 interprets the command and initializes itself to get ready
to go to the test mode.
6) The MSP53C691 pulls INRDY low, indicating that it is ready to receive test
data.
7) The master pulls R/W low, puts a nibble of test data on the bus, and pulses
the STROBE. When the STROBE is pulled low and then back to high, the
data is latched into the MSP53C691 at the rising edge of STROBE and the
MSP53C691 pulls INRDY high. Note that the data is sent on
DATA0–DATA3 lines only.
Most Significant
DATA LINES
DATA4
DATA3
DATA2
DATA1
DATA0
X
X
X
X
X
First nibble sent
8) When the data is latched into the MSP53C691, the MSP53C691 pulls
OUTRDY low.
9) The master then must pull R/W high and pull STROBE low.
10) The master then must read the data from data lines DATA4–DATA7. Note
that only the upper four bits of the bus (DATA4–DATA7) are valid data
echoed back to the master. After that the master must pull STROBE high,
indicating that the data has been read from the bus. OUTRDY goes high
at the rising edge of the STROBE.
11) The MSP53C691 pulls INRDY low again for the next data and the process
repeats.
Note:
The only way to get out of the test mode is to reset the device.
Summary of Contents for MSP53C691
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