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參數資料
| 型號： | GS1559-CB |
| 廠商： | Gennum Corporation |
| 英文描述： | GS1559 HD-LINX-TM II Multi-Rate Deserializer with Loop-Through Cable Driver |
| 中文描述： | GS1559的HD - LINX進程，商標第二多速率解串器與環通電纜驅動器 |
| 文件頁數： | 64/74頁 |
| 文件大小： | 686K |
| 代理商： | GS1559-CB |
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GS1559 Data Sheet
30572 - 4
July 2005
64 of 74
4.12 GSPI Host Interface
The GSPI, or Gennum Serial Peripheral Interface, is a 4-wire interface provided to
allow the host to enable additional features of the device and /or to provide
additional status information through configuration registers in the GS1559.
The GSPI comprises a serial data input signal SDIN, serial data output signal
SDOUT, an active low chip select CS, and a burst clock SCLK. The burst clock
must have a duty cycle between 40% and 60%.
Because these pins are shared with the JTAG interface port, an additional control
signal pin JTAG/HOST is provided. When JTAG/HOST is LOW, the GSPI interface
is enabled.
When operating in GSPI mode, the SCLK, SDIN, and CS signals are provided by
the host interface. The SDOUT pin is a high-impedance output allowing multiple
devices to be connected in parallel and selected via the CS input. The interface is
illustrated in
Figure 4-9
.
All read or write access to the GS1559 is initiated and terminated by the host
processor. Each access always begins with a 16-bit command word on SDIN
indicating the address of the register of interest. This is followed by a 16-bit data
word on SDIN in write mode, or a 16-bit data word on SDOUT in read mode.
Figure 4-9: Gennum Serial Peripheral Interface (GSPI)
4.12.1 Command Word Description
The command word is transmitted MSB first and contains a read/write bit, nine
reserved bits and a 6-bit register address. Set R/W = '1' to read and R/W = '0' to
write from the GSPI.
Command words are clocked into the GS1559 on the rising edge of the serial clock
SCLK. The appropriate chip select, CS, signal must be asserted low a minimum of
1.5ns (t
0
in
Figure 4-12
and
Figure 4-13
) before the first clock edge to ensure
proper operation.
Each command word must be followed by only one data word to ensure proper
operation.
SCLK
CS
SDOUT
SDIN
SCLK
CS
SDIN
SDOUT
Application Host
GS1559
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