TI380C30A Datasheet, PDF (16/81 Pages) Texas Instruments – INTEGRATED TOKEN-RING COMMPROCESSOR AND PHYSICAL-LAYER INTERFACE

TI380C30A
INTEGRATED TOKEN-RING COMMPROCESSOR
AND PHYSICAL-LAYER INTERFACE
SPWS034 – MARCH 1998
Terminal Functions (Continued)
TERMINAL
NAME NO.
I/O/E†
DESCRIPTION
VSS
11
30
38
78
—
Ground connections for commprocessor output buffers. All VSS pins must be attached to system ground
plane.
104
VSSA1
VSSA2
VSSA3
VSSC
150
—
Ground reference for receiver circuits
127
—
Ground reference for data-recovery PLL
125
Ground reference for the current-bias generator
10
21
57
—
Ground reference for commprocessor output buffers (clean ground). All VSSC pins must be attached to the
common-system ground plane.
102
VSSC1
160
Ground reference for physical layer output buffers
VSSD
159
—
Ground reference for physical layer output buffers
VSSL
22
46
88
—
Ground reference for digital logic. All VSSL pins must be attached to the common-system ground plane.
120
VSSL1
136
153
—
Ground reference for internal logic
VSSO
VSSP
VSSX
WFLT
131
—
Ground reference for XTAL oscillator
140
—
Ground reference for phantom drive
142
—
Ground reference for transmit output
Phantom-wire fault. WFLT provides an indication of the presence of a short or open circuit on PHOUTA or
PHOUTB.
167
O
H = No fault
L = Open or short. The DC fault condition is present in the phantom-drive lines.
WRAP
Internal wrap mode control. WRAP indicates the TI380C30A has placed the physical layer in the
loopback-wrap mode for adapter self test.
170
O
H = Normal ring operation
L = Physical-layer wrap mode selected
XFAIL
External fail-to-match signal. An EACO device uses XFAIL to indicate to the TI380C30A that it should not copy
the frame nor set the address-recognize indicator/frame-copied indicator (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
117
I
address-matched frame. If an EACO device is not used, XFAIL must be left unconnected. XFAIL is ignored
when copy-all-frames (CAF) mode is enabled [see table in XMATCH description section (see Note 1)].
H = No address match by external address checker
L = External address-checker-armed state
External match signal. An EACO device uses XMATCH to indicate to the TI380C30A 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).
H = Address match recognized by external address checker
L = External address-checker-armed state
XMATCH 118
I
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)
† _{I = input, O = output, E = provides external-component connection to the internal circuitry for tuning}
NOTE 1. Terminal has an internal pullup device to maintain a high-voltage level when left unconnected (no etch).
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