Texas Instruments TMS380C26 Token ring Ð ring interface timing, Parameter MIN TYP MAX Unit, Rclk

TMS380C26

NETWORK COMMPROCESSOR

SPWS010A±APRIL 1992±REVISED MARCH 1993

PARAMETER MEASUREMENT INFORMATION

token ring Ð ring interface timing

No.	PARAMETER		MIN TYP MAX	UNIT
153	Period of RCLK (see Note 14)	4Mbps	125	ns
		16 Mbps	31.25	ns
154L	Pulse duration of RCLK low	4 Mbps nominal: 62.5 ns	46	ns
		16 Mbps nominal: 15.625 ns	15	ns
154H	Pulse duration of RCLK high	4 Mbps nominal: 62.5 ns	35	ns
		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
		16 Mbps	15	ns
158H	Pulse duration of ring baud clock high	4 Mbps	40	ns
		16 Mbps	8	ns
165	Period of OSCOUT and PXTALIN (see Note 14)	4 Mbps	125	ns
		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.

153

154H

RCLK

154L

156

155

RCVR Valid

158H

158L

OSCOUT,

PXTALIN

165

Figure 19. Token Ring Ð Ring Interface Timing

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