w681308 Winbond Electronics Corp America, w681308 Datasheet - Page 47

• Manufacturer Part Number: w681308
• Description: Usb Audio Controller
• Manufacturer: Winbond Electronics Corp America

14.
14.1
W681308 built in a serial p
in
CODEC etc. This device has various clock speed and data format by setting relative control registers. The S
be operated at clock rates of up to MCU clock rate.
14.2
There are 5 control bits (CSN_ADD, CSN_MORE, CK_MORE, CP and CI) to decide the SPI control signal format. Register
0x14AB has detail description of the control bits.
The packet and page data format is separated to 2 fields: Command field and the Data field. Command field (0 ~ 5 bytes)
consists of control instruction/code and access address (TX only). Data field (0 ~ 256 bytes) consists of write and read data
of serial data flash (TX/RX). All Command and Data bytes are send MSB first. Command and Data field length can be
programmed in CMD_LEN (0x14A1[2:0]) and DATA_LEN (0x14A2[7:0]) register fields. It can be bypassed to write control bit
CMD_BYPASS or disable the DATA_ENB. The max command field length is 5 bytes. The max data field ength is 256 bytes
in unidirectional mode, and 128 bytes in
1
There are 3 states in the SPI Finite State Machine (FSM) module. The initial state is IDLE when power on.
After enable the SPI function (write 0x14A0[7] =1), the FSM start to wait for MCU control (write 0x14A1) to change to next
state. If the CMD BYPASS flag (0x14A1[5]) is true, the FSM will change to DATA state, then force control logic to shift in/out
the data bytes sequentially. If the CMD BYPASS flag ( 0x14A1[5]) is false, the FSM will change to the CMD state, then force
control logic to shift out the command bytes sequentially to external SPI device.
4.3
terface makes W681308 a
IDLE
Command (CMD)
Serial Peripheral Interface
Overview
Data and Signal Format of SPI
FSM of SPI
eripheral interface (SPI) port which is a 4-pin (SCLK, CS, SDI, SDO) SPI Interface. This SPI
n easy to control 4-pin SPI device including SPI data flash, SPI LCM, Nuvoton Pro-X SLIC
bidirectional mode. Thirteen examples are pro
Figure 12 SPI Block Diagram
XXXX PRODUCT DESCRIPTION
47
vided for reference.
l
W681308
Rev1.2
PI module can