ds3102 Maxim Integrated Products, Inc., ds3102 Datasheet - Page 50

• Manufacturer Part Number: ds3102
• Description: Stratum 3 Timing Card Ic With Synchronous Ethernet Support
• Manufacturer: Maxim Integrated Products, Inc.

increment its address counter, and prefetch the following byte. After the address counter reaches 3FFFh, it rolls
over to address 0000h and continues to increment.
Early Termination of Bus Transactions. The bus master can terminate SPI bus transactions at any time by
pulling CS high. In response to early terminations, the DS3102 resets its SPI interface logic and waits for the start
of the next transaction. If a write transaction is terminated prior to the SCLK edge that latches the LSB of a data
byte, the data byte is not written.
Design Option: Wiring SDI and SDO Together. Because communication between the bus master and the
DS3102 is half-duplex, the SDI and SDO pins can be wired together externally to reduce wire count. To support
this option, the bus master must not drive the SDI/SDO line when the DS3102 is transmitting.
AC Timing. See
Figure 7-5. SPI Clock Phase Options
Rev: 012108
____________________________________________________________________________________________ DS3102
SDI/SDO
SCLK
SCLK
SCLK
SCLK
CS
Table 10-10
CPOL = 0, CPHA = 0
CPOL = 0, CPHA = 1
CPOL = 1, CPHA = 0
CPOL = 1, CPHA = 1
and
Figure 10-4
MSB
CLOCK EDGE USED FOR DATA CAPTURE (ALL MODES)
6
for AC timing specifications for the SPI interface.
5
4
3
2
1
LSB
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