Texas Instruments TMS380C26 specifications Terminal Functions

TMS380C26

NETWORK COMMPROCESSOR

SPWS010A±APRIL 1992±REVISED MARCH 1993

Terminal Functions (continued)

PIN NAME	NO.	I/O					DESCRIPTION
			Network Select inputs. These pins are used to select the network speed and type to be used by the
			TMS380C26. These inputs should only be changed during adapter reset.
TEST 0	79	IN	TEST0 TEST1			TEST2	Description
TEST 1	78	IN		L	L	H	Reserved
TEST 2	77	IN
				L	H	H	16 Mbps token ring
				H	L	H	Ethernet (802.3/Blue Book)
				H	H	H	4 Mbps token ring
				X	X	0	Reserved
TEST3	76	IN	Test Pin Inputs. These pins should be left unconnected (see Note 1).
			Module-in-Place test mode is achieved by tying TEST 3 and TEST 4 pins to ground. In this mode,
TEST4	75	IN
			all TMS380C26 output pins are high impedance. Internal pullups on all TMS380C26 inputs will be
TEST5	74	IN
			disabled (except TEST3-TEST5 pins).
			External Fail-to-Match signal. An enhanced address copy option (EACO) device uses this signal to
			indicate to the TMS380C26 that it should not copy the frame nor set the ARI/FCI in bits in a token
			ring frame due to an external address match.The ARI/FCI bits in a token ring frame may be set due
			to an internal address matched frame. If an enhanced address copy option (EACO) device is NOT
XFAIL	80	IN	used, then this pin must be left unconnected. This pin is ignored when CAF mode is enabled.
			See table given below in XMATCH pin description (see Note 1).
			H	=	No address match by external address checker.
			L	=	External address checker armed state.
			External Match signal. An enhanced address copy option (EACO) device uses this signal to indicate
			to the TMS380C26 to copy the frame and set the ARI/FCI bits in a token ring frame. If an enhanced
			address copy option (EACO) device is NOT used, then this pin must be left unconnected. This pin
			is ignored when CAF mode is enabled (see Note 1).
			H	=	Address match recognized by external address checker.
			L	=	External address checker armed state.
XMATCH	81	IN
					XMATCH	XFAIL	Function
					0	0	Armed (Processing frame data).
					0	1	Do NOT externally match the frame. (XFAIL takes precedence)
					1	0	COPY the frame.
					1	1	Do NOT externally match the frame. (XFAIL takes precedence)
					HI-Z	HI-Z	Reset state (adapter not initialized).
	18		Positive supply voltage for digital logic. All VDD pins must be attached to the common system power
VDDL	34	IN
			supply plane.
	100
VDD1	82
VDD2	109		Positive supply voltage for output buffers. All VDD pins must be attached to the common system
VDD3	124	IN
VDD4	16		power supply plane.
VDD5	50
VDD6	66
	20		Ground reference for output buffers (clean ground). All VSS pins must be attached to the common
VSSC	65	IN
			system ground plane.
	116
VSSI	41	IN	Ground reference for input buffers. All VSS pins must be attached to the common system ground
	117		plane.

NOTE 1: Pin has an internal pullup device to maintain a high voltage level when left unconnected (no etch or loads).

18	POST OFFICE BOX 1443 •HOUSTON, TEXAS
	77251±1443