Microsemi SmartFusion2 - Table 350 HALF_DUPLEX; Table 351 MAX_FRAME_LENGTH

Ethernet MAC
UG0331 User Guide Revision 15.0 405
[11:10] Reserved 0x0 Reserved
[9:0] COLLISION WINDOW 0x37 This programmable field represents the slot time or collision
window during which collisions might occur in a properly
configured network. Since the collision window starts at the
beginning of the transmission, the preamble and start frame
delimiter (SFD) are included. The default of 0x37 (55d)
corresponds to the count of the frame bytes at the end of the
window.
Table 351 • MAX_FRAME_LENGTH
Bit Number Name Reset Value Description
[31:16] Reserved 0x0 Reserved
[15:0] MAXIMUM FRAME
LENGTH
0x600 This programmable field sets the maximum frame size in
both the transmit and receive directions.
Table 352 • TEST
Bit Number Name Reset Value Description
[31:4] Reserved 0x0 Reserved
3 MAXIMUM FRAME
LENGTH
0x0 Setting this bit causes the MAC to backoff for the maximum
possible length of time. This test bit is used to predict the
backoff times in Half-duplex mode.
2 REGISTERED
TRANSMIT FLOW
ENABLE
0x0 Registered transmit Half-duplex flow enable.
1 TEST PAUSE 0x0 Setting this bit allows the MAC to be paused via the host
interface for the testing purposes.
0 SHORTCUT SLOT
TIME
0x0 This bit allows the slot time counter to expire regardless of
the current count. This bit is for the testing purposes only.
Table 353 • MII_CONFIG
Bit Number Name Reset Value Description
31 RESET MII MGMT 0x0 Setting this bit resets MII Mgmt. Clearing this bit allows MII
Mgmt to perform Mgmt read/write cycles as requested via the
Host Interface.
30:6 Reserved 0x0 Reserved
Table 350 • HALF_DUPLEX (continued)
Bit Number Name
Reset
Value Description