DP83848HSQ National Semiconductor, DP83848HSQ Datasheet - Page 40

• Manufacturer Part Number: DP83848HSQ
• Description: IC, TRANSCEIVER, ENET PHYTER, 40LLP
• Manufacturer: National Semiconductor

Specifications of DP83848HSQ

• Data Rate: 100Mbps
• No. Of Ports: 1
• Ethernet Type: IEEE 802.3u
• Supply Current: 92mA
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +125°C
• Digital Ic Case Style: LLP
• No. Of: RoHS Compliant
• Interface Type: MII Serial, RMII
• Rohs Compliant: Yes

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7.1.1 Basic Mode Control Register (BMCR)
Bit
15
14
13
12
11
10
9
8
Auto-Negotiation
Speed Selection
Restart Auto-
Duplex Mode
Power Down
Negotiation
Bit Name
Loopback
Enable
Isolate
Reset
Table 12. Basic Mode Control Register (BMCR), address 0x00
Strap, RW
0, RW/SC
0, RW/SC
Default
0, RW
0, RW
0, RW
RW
RW
Reset:
1 = Initiate software Reset / Reset in Process.
0 = Normal operation.
This bit, which is self-clearing, returns a value of one until the reset
process is complete. The configuration is re-strapped.
Loopback:
1 = Loopback enabled.
0 = Normal operation.
The loopback function enables MII transmit data to be routed to the MII
receive data path.
Setting this bit may cause the descrambler to lose synchronization and
produce a 500 s “dead time” before any valid data will appear at the
MII receive outputs.
Speed Select:
When auto-negotiation is disabled writing to this bit allows the port
speed to be selected.
1 = 100 Mb/s.
0 = 10 Mb/s.
Auto-Negotiation Enable:
Strap controls initial value at reset.
1 = Auto-Negotiation Enabled - bits 8 and 13 of this register are ig-
nored when this bit is set.
0 = Auto-Negotiation Disabled - bits 8 and 13 determine the port speed
and duplex mode.
Power Down:
1 = Power down.
0 = Normal operation.
Setting this bit powers down the PHY. Only the register block is en-
abled during a power down condition.
Isolate:
1 = Isolates the Port from the MII with the exception of the serial man-
agement.
0 = Normal operation.
Restart Auto-Negotiation:
1 = Restart Auto-Negotiation. Re-initiates the Auto-Negotiation pro-
cess. If Auto-Negotiation is disabled (bit 12 = 0), this bit is ignored. This
bit is self-clearing and will return a value of 1 until Auto-Negotiation is
initiated, whereupon it will self-clear. Operation of the Auto-Negotiation
process is not affected by the management entity clearing this bit.
0 = Normal operation.
Duplex Mode:
When auto-negotiation is disabled writing to this bit allows the port Du-
plex capability to be selected.
1 = Full Duplex operation.
0 = Half Duplex operation.
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Description