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CS62180 데이터시트(PDF) 8 Page - Cirrus Logic |
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CS62180 데이터시트(HTML) 8 Page - Cirrus Logic |
8 / 50 page HOST MODE Serial Interface For applications in which the device is to interface with a host processor, the CS62180B can be configured to run in host modeby tying the Serial Port Select pin (SPS) to the +5V supply (VDD). This allows access to the serial port, providing a large number of configuration options via the 16 on-chip control and status registers. Serial read/write timing, controlled by SCLK, is entirely independent of the transmit and receive timing. This allows the host microcontroller to monitor the status register and counters, modify configuration options, and issue commands asyn- chronously with the T1 system. A serial timing overview is provided in Figure 1. All data transfers are initiated by setting Chip Se- lect (CS) low. Any read or write to the serial port is initiated by writing an 8-bit command word. The command word consists of 4 separate fields (see Figure 2). When reading from the port, data is out- put on the falling edge of SCLK, and held until the next falling edge. All data is written to and read from the port LSB first. When writing to the port, SDI input data is sampled on the rising edge of SCLK. D0 (LSB) is the R/W field, and specifies whether the current operation is to be a read or a write: 1 = read, 0 = write. The second 4 bits (D1 - D4) con- tain the address field. Written LSB first, they specify which of the sixteen registers to access. D5 (Device Select) should be set to zero when address- ing the CS62180B. However, if the CS62180B shares the same serial interface lines with a Cirrus TI Line Interface (see Figure 3), D5 will be set to a "1" when addressing the Line Interface device. The CS62180B will ignore any read/write commandswith a "1" in D5, allowing both parts to share CS. D6 is reserved, and must be set to 0 for normal operation. 7 (MSB) 654321 0 (LSB) BM 0 DS ADD3 ADD2 ADD1 ADD0 R/W 0 Individual Set to "0" 0 CS62180B (MSB) Register Address Field (LSB) 0Write 1 Burst 1 Crystal LIU 1 Read Figure 2. Address Command Byte (ACB) R/W ADD0 ADD1 ADD2 ADD3 0 0 BM D7 D6 D5 D4 D3 D2 D1 D0 CS SCLK SDO SDI Write Address Command Byte (ACB) Read or Write Register Data D6 D5 D4 D3 D2 D1 D0 D7 Figure 1. Serial Read/Write Timing CS62180B 8 DS225PP2 |
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