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Diffstat (limited to 'qemu/roms/u-boot/doc/README.VSC3316-3308')
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diff --git a/qemu/roms/u-boot/doc/README.VSC3316-3308 b/qemu/roms/u-boot/doc/README.VSC3316-3308 new file mode 100644 index 000000000..925663ba5 --- /dev/null +++ b/qemu/roms/u-boot/doc/README.VSC3316-3308 @@ -0,0 +1,43 @@ +This file contains API information of the initialization code written for +Vitesse cross-point devices, VSC3316 and VSC3308 for board B4860QDS + +Author: Shaveta Leekha <shaveta@freescale.com> + +About Device: +============= +VSC 3316/3308 is a low-power, low-cost asynchronous crosspoint switch capable of data rates upto 11.5Gbps. + +VSC3316 has 16 input and 16 output ports whereas VSC3308 has 8 input and 8 output ports. Programming of these devices are performed by two-wire or four-wire serial interface. + +Initialization: +=============== +On reset, VSC devices are in low-power state with all inputs, outputs and connections in an off state. +First thing required is to program it to interface with either two-wire or four-wire interface. +In our case the interface is two-wire I2C serial interface. So the value in Interface mode register at address 79.h to be written is 0x02 for two-wire interface. Also for crosspoint connections to be activated, 01.h value need to be written in 75.h (core configuration register). + +API Overview: +============= + + vsc_if_enable(u8 vsc_addr): + -------------------------- + This API programs VSC to interface with either two-wire or four-wire interface. In our case the interface is two-wire I2C serial interface. So the value in Interface mode register at address 79.h to be written is 0x02 for two-wire interface. + Parameters: + vsc_addr - Address of the VSC device on board. + + + vsc3316_config(u8 vsc_addr, int con_arr[][2], u8 num_con): + --------------------------------------------------------- + This API configures the VSC3316 device for required connections. Connection through the VSC device requires the inputs and outputs to be properly configured. + Connection registers are on page 00. It Configures the selected input and output correctly and join them to make a connection. It also program Input state register, Global input ISE, Global input LOS, Global core control, Output mode register and core control registers etc. + vsc3308_config(u8 vsc_addr, int con_arr[][2], u8 num_con) does the essential configurations for VSC3308. + + Parameters: + vsc_addr - Address of the VSC device on board. + con_arr - connection array + num_con - number of connections to be configured + + vsc_wp_config(u8 vsc_addr): + -------------------------- + For crosspoint connections to be activated, 01.h value need to be written in 75.h (core configuration register), which is done by this API. + Parameters: + vsc_addr - Address of the VSC device on board. |