Sun Microsystems 60 service manual EBus DMA/TCR Registers, Ethernet

4.7.2EBus DMA/TCR Registers

The EBus DMA/TCR registers diagnostic performs the following:

1.DMA_reg_test – Performs a walking ones bit test for control status register, address register, and byte count register of each channel. Verifies that the control status register is set properly.

2.DMA_func_test – Validates the DMA capabilities and FIFOs. Test is executed in a DMA diagnostic loopback mode. Initializes the data of transmitting memory with its address, performs a DMA read and write, and verifies that the data received is correct. Repeats for four channels.

CODE EXAMPLE 4-10identifies the EBus DMA/TCR registers output message.

CODE EXAMPLE 4-10EBus DMA/TCR Registers Output Message

Enter (0-12 tests, 13 -Quit, 14 -Menu) ===> 1

TEST=’all_dma/ebus_test’

SUBTEST=’dma_reg_test’

SUBTEST=’dma_func_test’

Enter (0-12 tests, 13 -Quit, 14 -Menu) ===>

4.7.3Ethernet

The Ethernet diagnostic performs the following:

1.my_channel_reset – Resets the Ethernet channel.

2.hme_reg_test – Performs walk1 on the following registers set: global register 1, global register 2, bmac xif register, bmac tx register, and the mif register.

3.MAC_internal_loopback_test – Performs Ethernet channel engine internal loopback.

4.10_mb_xcvr_loopback_test – Enables the 10Base-T data present at the transmit MII data inputs to be routed back to the receive MII data outputs.

5.100_mb_phy_loopback_test – Enables MII transmit data to be routed to the MII receive data path.

6.100_mb_twister_loopback_test – Forces the twisted-pair transceiver into loopback mode.

4-16Sun Ultra 60 Service Manual • August 2001