OM11077 NXP Semiconductors, OM11077 Datasheet - Page 223

• Manufacturer Part Number: OM11077
• Description: MODULE DIMM LPC2478 ARM7
• Manufacturer: NXP Semiconductors

Specifications of OM11077

• Accessory Type: Module Card
• For Use With/related Products: ARM-57TS-LPC2478
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-4742

NXP Semiconductors
Table 190. Back-to-back Inter-packet-gap register (IPGT - address 0xFFE0 0008) bit description
Table 191. Non Back-to-back Inter-packet-gap register (IPGR - address 0xFFE0 000C) bit description
UM10237_4
User manual
Bit
6:0
31:7
Bit
6:0
7
14:8
31:15 -
Symbol
NON-BACK-TO-BACK
INTER-PACKET-GAP PART2
-
NON-BACK-TO-BACK
INTER-PACKET-GAP PART1
Symbol
BACK-TO-BACK
INTER-PACKET-GAP
-
7.1.3 Back-to-Back Inter-Packet-Gap Register (IPGT - 0xFFE0 0008)
7.1.4 Non Back-to-Back Inter-Packet-Gap Register (IPGR - 0xFFE0 000C)
7.1.5 Collision Window / Retry Register (CLRT - 0xFFE0 0010)
The Back-to-Back Inter-Packet-Gap register (IPGT) has an address of 0xFFE0 0008. Its
bit definition is shown in
The Non Back-to-Back Inter-Packet-Gap register (IPGR) has an address of
0xFFE0 000C. Its bit definition is shown in
The Collision window / Retry register (CLRT) has an address of 0xFFE0 0010. Its bit
definition is shown in
Function
This is a programmable field representing the nibble time offset of the minimum
possible period between the end of any transmitted packet to the beginning of the
next. In Full-Duplex mode, the register value should be the desired period in
nibble times minus 3. In Half-Duplex mode, the register value should be the
desired period in nibble times minus 6. In Full-Duplex the recommended setting is
0x15 (21d), which represents the minimum IPG of 960 ns (in 100 Mbps mode) or
9.6 µs (in 10 Mbps mode). In Half-Duplex the recommended setting is 0x12 (18d),
which also represents the minimum IPG of 960 ns (in 100 Mbps mode) or 9.6 µs
(in 10 Mbps mode).
Reserved. User software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
Function
This is a programmable field representing the Non-Back-to-Back
Inter-Packet-Gap. The recommended value is 0x12 (18d), which
represents the minimum IPG of 960 ns (in 100 Mbps mode) or 9.6 µs (in
10 Mbps mode).
Reserved. User software should not write ones to reserved bits. The value
read from a reserved bit is not defined.
This is a programmable field representing the optional carrierSense
window referenced in IEEE 802.3/4.2.3.2.1 'Carrier Deference'. If carrier is
detected during the timing of IPGR1, the MAC defers to carrier. If,
however, carrier becomes active after IPGR1, the MAC continues timing
IPGR2 and transmits, knowingly causing a collision, thus ensuring fair
access to medium. Its range of values is 0x0 to IPGR2. The recommended
value is 0xC (12d)
Reserved. User software should not write ones to reserved bits. The value
read from a reserved bit is not defined.
Table
Rev. 04 — 26 August 2009
Table
11–192.
11–190.
Table
11–191.
Chapter 11: LPC24XX Ethernet
UM10237
© NXP B.V. 2009. All rights reserved.
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Reset
value
0x0
0x0
Reset
value
0x0
0x0
0x0
0x0