Texas Instruments SPRU938B manual Chip Version Register Chipver, Auto Negotiation Register Autngo

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VLYNQ Port Registers

3.17 Chip Version Register (CHIPVER)

VLYNQ allows inter-connection of many VLYNQ devices. In order for software to control the device functions, there must be a mechanism that allows the software to identify VLYNQ devices. Each device that has a VLYNQ module in it has a unique device ID associated with it, which is software readable via a memory-mapped register within the VLYNQ module called the chip version register (CHIPVER). This is also useful in communicating with remote devices, as the local VLYNQ device register map contains a copy of the remote device'sregisters as well. This allows the software to determine the remote chip ID and, hence, determine the remote memory-map without trying to access random remote addresses to find a device ID register. The CHIPVER is shown in Figure 25 and described in Table 22.

	Figure 25. Chip Version Register (CHIPVER)
31	16
	DEVREV
	R-0
15	0

DEVID

R-2Dh

LEGEND: R = Read only; -n= value after reset

Table 22. Chip Version Register (CHIPVER) Field Descriptions

Bit	Field	Value	Description
31-16	DEVREV	0-FFFFh	Device revision. This field reflects the value of the device revision pins.
15-0	DEVID	0-FFFFh	Device ID.
		2Dh	DM643x device ID.

3.18 Auto Negotiation Register (AUTNGO)

The auto negotiation register (AUTNGO) reflects the ability of the VLYNQ module residing in the device to communicate with the remote VLYNQ device on their respective abilities after reset. The AUTNGO is shown in Figure 26 and described in Table 23.

Figure 26. Auto Negotiation Register (AUTNGO)

31	17	16
Reserved		2X
R-0		R-0
15		0
Reserved

R-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

Table 23. Auto Negotiation Register (AUTNGO) Field Descriptions

Bit	Field	Value	Description
31-17	Reserved	0	Reserved. Always read as 0. Writes have no effect.
16	2X		Version 2.x mode.
		0	Indicates that a link was established with a remote device that has a version 1.x VLYNQ module in it.
		1	Indicates that a link was established with a remote device that has a version 2.x VLYNQ module in it.
15-0	Reserved	0	Reserved. Always read as 0. Writes have no effect.
SPRU938B –September 2007			VLYNQ Port	37
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