Visible to Intel only — GUID: iga1401395001680
Ixiasoft
Visible to Intel only — GUID: iga1401395001680
Ixiasoft
4.1.2. Operation
- 0x4a—Idle character. The core drops the idle character.
- 0x4d—Escape character. The core drops the escape character, and XORs the following byte with 0x20.
For each valid byte of data received, the core asserts the valid signal on its Avalon® -ST source interface and presents the byte on the interface for one clock cycle.
At the same time, the core shifts data out from the Avalon® -ST sink to the output signal miso beginning with from the most significant bit. If there is no data to shift out, the core shifts out idle characters (0x4a). If the data is a special character, the core inserts an escape character (0x4d) and XORs the data with 0x20.
The data shifts into and out of the core in the direction of MSB first.
Symbol | Description | Minimum | Maximum | Unit |
---|---|---|---|---|
TL | The worst recovery time of sclk with respect with nSS. | ½ SPI clock | - | Clock cycle |
TT | The worst hold time for MOSI and MISO data. | ½ SPI clock | - | |
TI | The minimum width of a reset pulse required by Intel FPGA families. | 1 SPI clock | - |