Texas Instruments TNETE100A Adapter Host Registers, Table A±5. HostCMD Register Bits, Hostcmd

Adapter Host Registers

A.2 Adapter Host Registers

Host command registers contain bits which are toggled to tell the channel to use receive or transmit FIFOs. ThunderLAN's adapter host registers include the adapter internal registers (see section A.3, Adapter Internal Registers). The following subsections describe the functions of each host register accord- ing to protocol.

Figure A±3. Host Interface Address Map

			Base address
31	16 15	0	offset
	HOST_CMD		+0
	CH_PARM		+4
	HOST_INT	DIO_ADR	+8
	DIO_DATA		+12

A.2.1 Host Command Register±HOST_CMD @ Base_Address + 0 (Host)

Byte 3																		Byte 2
31	30		29		28		27	26	25	24	23	22	21	20	19	18	17	16
Go		Stop		Ack					Ch_Sel					EOC	R/T	Nes	0		0
Byte 1																		Byte 0
15	14		13		12		11	10	9	8	7	6	5	4	3	2	1	0
Ad		Ld		Id		Req	Ints	Ints	Reserved					Ack Count
Rst		Tmr		Thr		Int	off	on

Table A±5. Host_CMD Register Bits

Bit	Name	Function
31	Go	Channel go: This command bit only affects the network channels.
		if R/T = 0 (Tx GO):
		Writing a 1 to this bit starts frame transmission on a stopped or inactive channel.
		Ch_Parm contains the address of the first transmit list.
		if R/T = 1 (Rx GO):
		Writing a 1 to this bit starts frame reception on a stopped1 or inactive channel. Ch_Parm
		contains the address of the first receive list.
		Writing a 0 to this bit has no effect. This bit is always read as a 0.

1)Frame transmission and reception are always placed in the stopped (reset) state after reset. therefore, no frames are received into the Rx FIFO and no statistics are logged until the receiver has been started with a GO command.

A-12