JAJSFP8A July 2018 – October 2018 DS90UH940N-Q1
PRODUCTION DATA.
In normal operation, GPIOx pins may be used as GPIOs in either forward channel (outputs) or back channel (inputs) mode. GPIO and D_GPIO modes may be configured through the registers (Table 11). The same registers configure either GPIOx or D_GPIOx pins, depending on the status of PORT1_SEL and PORT0_SEL bits (0x34[1:0]). D_GPIO mode operation requires 2-lane FPD-Link III mode. Consult the appropriate serializer data sheet for details on D_GPIOx pin configuration. Note: if paired with a DS90UH925Q-Q1 serializer, the devices must be configured into 18-bit mode to allow usage of GPIO pins on the serializer. To enable 18-bit mode, set serializer register 0x12[2] = 1. 18-bit mode is auto-loaded into the deserializer from the serializer. See Table 2 for GPIOx pins enable and configuration.
DESCRIPTION | DEVICE | FORWARD CHANNEL | BACK CHANNEL |
---|---|---|---|
GPIO3 / D_GPIO3 | Serializer | 0x0F[3:0] = 0x3 | 0x0F[3:0] = 0x5 |
Deserializer | 0x1F[3:0] = 0x5 | 0x1F[3:0] = 0x3 | |
GPIO2 / D_GPIO2 | Serializer | 0x0E[7:4] = 0x3 | 0x0E[7:4] = 0x5 |
Deserializer | 0x1E[7:4] = 0x5 | 0x1E[7:4] = 0x3 | |
GPIO1 / D_GPIO1 | Serializer | 0x0E[3:0] = 0x3 | 0x0E[3:0] = 0x5 |
Deserializer | 0x1E[3:0] = 0x5 | 0x1E[3:0] = 0x3 | |
GPIO0 / D_GPIO0 | Serializer | 0x0D[3:0] = 0x3 | 0x0D[3:0] = 0x5 |
Deserializer | 0x1D[3:0] = 0x5 | 0x1D[3:0] = 0x3 |
The input value present on GPIO[3:0] or D_GPIO[3:0] may also be read from register or configured to local output mode (Table 11).