HD151TS207SS Datasheet, PDF (26/38 Pages) Renesas Technology Corp – Mother Board Clock Generator for Intel P4+ Chipset (Springdale)

HD151TS207SS
Renesas clock generator I²C Serial Interface Operation (cont.)
2. Read mode
2.1 Controller (host) sends a start bit.
2.2 Controller (host) sends the write address D2 (h).
2.3 Renesas clock generator will acknowledge (Renesas clock gen. sends “Low”).
2.4 Controller (host) sends a begin byte M.
2.5 Renesas clock generator will acknowledge (Renesas clock gen. sends “Low”).
2.6 Controller (host) sends a restart bit.
2.7 Controller (host) sends the read address D3 (h).
2.8 Renesas clock generator will acknowledge (Renesas clock gen. sends “Low”).
2.9 Renesas clock generator will send the byte count N.
2.10 Controller (host) will acknowledge.
2.11 Renesas clock generator will send data from byte M to byte M+N–1.
2.12 When Renesas clock generator sends the last byte, controller (host) will not acknowledge.
2.13 Controller (host) sends a stop bit.
1 bit
Start bit
7 bits
1 bit 1 bit
8 bits
1 bit 1 bit
7 bits 1 bit
Slave
R/W _{Ack Begin Byte = M Ack Restart bit} ^Slave
R/W
address _D2(h)
address _D3(h)
1 bit
8 bits
1 bit 8 bits 1 bit 8 bits 1 bit
Ack Begin Count = N Ack Byte M Ack Byte M+1 Ack
8 bits
1 bit 1 bit
Byte M+N–1 Not Ack Stop bit
Notes: 1. Renesas clock generator is a slave/receiver, I²C component. It can read back the data stored in
the latches for the verification.
2. The data transfer rate supported by this clock generator is 100k bits/sec or less (standard
mode).
3. The input is operating at 3.3 V logic levels.
4. The data byte format is 8 bit bytes.
5. To simplify the clock generator I²C interface, the protocol is set to use only block-write from
the controller.
6. The bytes must be accessed in sequential order from lowest to highest byte with the ability to
stop after any complete byte has been transferred. The data is loaded until a stop sequence is
issued.
7. At power-on, all registers are set to a default condition, as shown.
Rev.1.00, Apr.25.2003, page 26 of 38