TI380C60A Datasheet, PDF (3/16 Pages) Texas Instruments – CMOS TOKEN-RING INTERFACE DEVICE

TI380C60A
CMOS TOKEN-RING INTERFACE DEVICE
SPWS033 – DECEMBER 1996
Pin Functions (Continued)
PIN
NAME
NO.
I / O / E† TYPE‡
DESCRIPTION
RATER
Rate error. RATER indicates that there are transitions on the RCV+ / RCV– input pair
47
O
TTL (DRVR+ / DRVR– if WRAP is asserted low) but that the transition rate is not consistent with the
ring speed selected by S4 / 16.
RCLK
51
O
TTL
Recovered clock. RCLK is the clock recovered from the token-ring received data. For 16-Mbps
operations, it is a 32-MHz clock. For 4-Mbps operations, it is an 8-MHz clock.
RCV+
RCV–
38
I
36
I
D
D
Receiver inputs. RCV+ and RCV– receive the token-ring data by way of isolation transformers.
RCVR
Recovered data. RCVR contains the data recovered from the token ring and should be sampled
50
O
TTL _{at the rising edge of RCLK.}
REDY
PLL ready. REDY is normally asserted (active) low. REDY is cleared following the assertion of
12
O
TTL
FRAQ and reasserted after the data-recovery PLL has been reinitialized.
H = Received data not valid
L = Received data valid
RES
25
—
— Reserved. RES should be left unconnected.
S4 / 16
Speed switch. S4 / 16 specifies the token-ring data rate.
14
I
TTL
H = 4-Mbps data rate
L = 16-Mbps data rate
TCLK
TMS
TDI
TDO
43
I
42
45
I
I
TTL
Test ports used during the production test of the device. TCLK, TMS, TDI, and TDO should be
left unconnected.
46
O
TRST
Test-port reset. TRST should be tied to ground for normal operation of the TI380C60A.
44
I
TTL
H = Reserved
L = Test ports forced to an idle state
WFLT
Phantom-wire fault. WFLT provides an indication of the presence of a short or open circuit on
7
O
TTL
PHOUTA or PHOUTB.
H = No fault
L = Open or short. The dc fault condition is present in the phantom-drive lines.
WRAP
Internal wrap-mode control. WRAP allows the TI380C60A to be placed in the loop-back wrap
mode for adapter self test.
3
I
TTL
H = Normal ring operation
L = Transmit data drives the receive data. RCV+ and RCV– are ignored by the TI380C60A,
and XMT+ and XMT– are both forced low.
XMT+
XMT–
18
Transmit differential outputs. XMT+ and XMT– provide a low-impedance differential source for
19
E
D
line drive by way of filtering and transformer isolation.
XT1
XT2
31
29
E
N / TTL XTAL connection. An 8-MHz crystal network can be connected here to provide a reference clock
N for the TI380C60A. Alternatively, an 8-MHz TTL clock source can be connected to XT1.
VDDA1
37
—
— Positive supply voltage for receiver circuits
VDDD
2, 49
—
— Positive supply voltage for output buffers
VDDL
11, 27
—
— Positive supply voltage for internal logic
VDDA2
32
—
— Positive supply voltage for data-recovery PLL
VDDO
28
—
— Positive supply voltage for XTAL oscillator
VDDP
24
—
— Positive supply voltage for phantom drive
VDDX
20
—
— Positive supply voltage for transmit output
† _{I = input, O = output, E = provides external-component connection to the internal circuitry for tuning}
‡ _{TTL = TTL signal, N = non-TTL signal, D = differential drive or data}
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