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TMS380C26
NETWORK COMMPROCESSOR
SPWS010A–APRIL 1992–REVISED MARCH 1993
POST OFFICE BOX 1443 • HOUSTON, TEXAS
77251–1443
54
PARAMETER MEASUREMENT INFORMATION
token ring — ring interface timing
No. PARAMETER MIN TYP MAX UNIT
153
Period of RCLK (see Note 14)
4Mbps 125 ns
153
Period
of
RCLK
(see
Note
14)
16 Mbps 31.25 ns
154L
Pulse duration of RCLK low
4 Mbps nominal: 62.5 ns 46 ns
154L
P
u
lse
d
u
ration
of
RCLK
lo
w
16 Mbps nominal: 15.625 ns 15 ns
154H
Pulse duration of RCLK high
4 Mbps nominal: 62.5 ns 35 ns
154H
P
u
lse
d
u
ration
of
RCLK
high
16 Mbps nominal: 15.625 ns 8 ns
155 Setup of RCVR valid before rising edge (1.8 V) of RCLK at 16 Mbps 10 ns
156 Hold of RCVR valid after rising edge (1.8 V) of RCLK at 16 Mbps 4 ns
158L
Pulse duration of ring baud clock low
4 Mbps 40 ns
158L
P
u
lse
d
u
ration
of
ring
ba
u
d
clock
lo
w
16 Mbps 15 ns
158H
Pulse duration of ring baud clock high
4 Mbps 40 ns
158H
P
u
lse
d
u
ration
of
ring
ba
u
d
clock
high
16 Mbps 8 ns
165
Period of OSCOUT and PXTALIN (see Note 14)
4 Mbps 125 ns
165
Period
of
OSCOUT
and
PXTALIN
(see
Note
14)
16 Mbps (for PXTALIN only) 31.25 ns
166 Tolerance of PXTALIN input frequency (see Note 14) ± 0.01 %
NOTE 14: This parameter is not tested but is required by the IEEE 802.5 specification.
PXTALIN
OSCOUT,
RCVR
RCLK
158L
155
154L
156
154H
153
Valid
158H
165
Figure 19. Token Ring — Ring Interface Timing