Digi NS9215 manual X i m u m F r a m e r e g i s t e r, Cwin, Collision window, Retx

E T H E R N E T C O M M U N I C A T I O N M O D U L E

Maximum Frame register

Register bit

assignment	Bits	Access	Mnemonic	Reset	Description
	D31:14	N/A	Reserved	N/A	N/A
	D13:08	R/W	CWIN	0x37	Collision window
					Programmable field indicating the slot time or collision
					window during which collisions occur in properly
					configured networks. Because the collision window
					starts at the beginning of transmissions, the preamble
					and SFD (start-of-frame delimiter) are included.
					The default value (0x37 (55d)) corresponds to the frame
					byte count at the end of the window.
	D07:04	N/A	Reserved	N/A	N/A
	D03:00	R/W	RETX	0xF	Retransmission maximum
					Programmable field specifying the number of
					retransmission attempts following a collision before

aborting the frame due to excessive collisions. The 802.3u standard specifies the attemptLimit to be 0xF (15d).

M a x i m u m F r a m e r e g i s t e r

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Address: A060 0414

Register

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16
							Reserved
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
							MAXF

294Hardware Reference NS9215