TI380C27 Datasheet, PDF (15/77 Pages) Texas Instruments – DUAL-PROTOCOL COMMPROCESSOR

TI380C27
DUAL-PROTOCOL COMMPROCESSOR
Pin Functions (Continued)
SPWS014A – APRIL 1994 – REVISED MARCH 1995
PIN
NAME
NO.
TEST0
103
TEST1
102
TEST2
101
TEST3
100
TEST4
99
TEST5
98
XFAIL
104
I/O ^†
I
I
I
DESCRIPTION
Network select inputs. TEST0 – TEST2 are used to select the network speed and type to be used by
the TI380C27. These inputs should be changed only during adapter reset. Connect TEST2 to VDDL.
TEST0
L
L
H
H
X
TEST1
L
H
L
H
X
TEST2
H
H
H
H
L
DESCRIPTION
Full-duplex Ethernet
16-Mbps token ring
Half-duplex Ethernet
4-Mbps token ring
Reserved
Test inputs. TEST3 – TEST5 should be left unconnected (see Note 1). Module-in-place test mode is
achieved by tying TEST3 and TEST4 to ground. In this mode, all TI380C27 outputs are in the
high-impedance state. Internal pullups on all TI380C27 inputs are disabled (except TEST3 – TEST5).
External fail-to-match signal. An enhanced-address-copy-option (EACO) device uses XFAIL to
indicate to the TI380C27 that it should not copy the frame nor set the ARI/FCI bits in a token-ring frame
due to an external address match.The ARI/FCI bits in a token-ring frame can be set due to an internal
address-matched frame. If an EACO device is not used, XFAIL must be left unconnected. XFAIL is
ignored when CAF mode is enabled [see table in XMATCH 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 XMATCH to indicate
to the TI380C27 to copy the frame and set the ARI/FCI bits in a token-ring frame. If an EACO device
is not used, XMATCH must be left unconnected. XMATCH is ignored when CAF mode is enabled
(see Note 1).
XMATCH
H = Address match recognized by external address checker
105
I
L = External address-checker-armed state
VDDL
XMATCH
0
0
1
1
Hi-Z
XFAIL
0
1
0
1
Hi-Z
FUNCTION
Armed (processing frame data)
Do not externally match the frame (XFAIL takes precedence).
Copy the frame
Do not externally match the frame (XFAIL takes precedence).
Reset state (adapter not initialized)
37
55
126
I
Positive-supply voltage for digital logic. All VDDL pins must be attached to the common-system
power-supply plane.
VDD
106
137
9
34
I
Positive-supply voltage for output buffers. All VDD pins must be attached to the common-system
power-supply plane.
72
89
39
VSSC
87
117
I
Ground reference for output buffers (clean ground). All VSSC pins must be attached to the
common-system ground plane.
144
† _{I = input, O = output}
NOTE 1: Pin has an internal pullup device to maintain a high-voltage level when left unconnected (no etch).
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