SPRUJ42 User guide

SPRUJ42E March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1

PRODUCTION DATA

1.2.159.1 CPSW_NC_ETH_MAC_PN_MAC_BOFFTEST_REG_K Register (Offset = 2233Ch) [reset = 0h]

Enet Port N Mac Backoff Test

Offset = Base + (k * 1000h); where k = 0 to 1d

Table 5-318 Instance Table

Instance Name	Physical Address
CPSW0	5282 233Ch + formula

Figure 5-159 CPSW_NC_ETH_MAC_PN_MAC_BOFFTEST_REG_K Name Register

Table 5-319 CPSW_NC_ETH_MAC_PN_MAC_BOFFTEST_REG_K Register Field Descriptions

Bit	Field	Type	Reset	Description
31	RESERVED	NONE	0h	Reserved
30:26	PACEVAL	R/W	0h	Pacing Current Value - A non-zero value in this field indicates that transmit pacing is active. A transmit frame collision or deferral causes paceval to loaded with decimal 31, good frame transmissions (with no collisions or deferrals) cause paceval to be decremented down to zero. When paceval is nonzero, the transmitter delays 4 IPGs between new frame transmissions after each successfully transmitted frame that had no deferrals or collisions. Transmit pacing helps reduce capture effects improving overall network bandwidth.
25:16	RNDNUM	R/W	0h	Backoff Random Number Generator - This field allows the Backoff Random Number Generator to be read (or written in test mode only). This field can be written only when pn_mtest has previously been set. Reading this field returns the generator's current value. The value is reset to zero and begins counting on the clock after the de-assertion of reset.
15:12	COLL_COUNT	R	0h	Collision Count - The number of collisions the current frame has experienced.
11:10	RESERVED	NONE	0h	Reserved
9:0	TX_BACKOFF	R	0h	Backoff Count - This field allows the current value of the backoff counter to be observed for test purposes. This field is loaded automatically according to the backoff algorithm, and is decremented by one for each slot time after the collision.