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| 型号： | DP83848YB-EVK/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 53/86页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD PHYTER EXTREME TEMP |
| 标准包装： | 1 |
| 主要目的： | 接口，以太网 |
| 已用 IC / 零件： | DP83848YB |
| 已供物品： | 板 |
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YB
7.2.7 RMII and Bypass Register (RBR)
This register configures the RMII Mode of operation. When RMII mode is disabled, the RMII functionality is bypassed.
7.2.8 LED Direct Control Register (LEDCR)
This register provides the ability to directly control any or all LED outputs. It does not provide read access to LEDs.
Table 27. RMII and Bypass Register (RBR), addresses 0x17
Bit
Bit Name
Default
Description
15:6
RESERVED
0, RO
RESERVED: Writes ignored, read as 0.
5
RMII_MODE
Strap, RW
Reduced MII Mode:
0 = Standard MII Mode
1 = Reduced MII Mode
4
RMII_REV1_0
0, RW
Reduce MII Revision 1.0:
0 = (RMII revision 1.2) CRS_DV will toggle at the end of a packet
to indicate deassertion of CRS.
1 = (RMII revision 1.0) CRS_DV will remain asserted until final data
is transferred. CRS_DV will not toggle at the end of a packet.
3
RX_OVF_STS
0, RO
RX FIFO Over Flow Status:
0 = Normal
1 = Overflow detected
2
RX_UNF_STS
0, RO
RX FIFO Under Flow Status:
0 = Normal
1 = Underflow detected
1:0
ELAST_BUF[1:0]
01, RW
Receive Elasticity Buffer. This field controls the Receive Elastic-
ity Buffer which allows for frequency variation tolerance between
the 50MHz RMII clock and the recovered data. The following val-
ues indicate the tolerance in bits for a single packet. The minimum
setting allows for standard Ethernet frame sizes at +/-50ppm accu-
racy for both RMII and Receive clocks. For greater frequency tol-
erance the packet lengths may be scaled (i.e. for +/-100ppm, the
packet lengths need to be divided by 2).
00 = 14 bit tolerance (up to 16800 byte packets)
01 = 2 bit tolerance (up to 2400 byte packets)
10 = 6 bit tolerance (up to 7200 byte packets)
11 = 10 bit tolerance (up to 12000 byte packets)
Table 28. LED Direct Control Register (LEDCR), address 0x18
Bit
Bit Name
Default
Description
15:6
RESERVED
0, RO
RESERVED: Writes ignored, read as 0.
5
DRV_SPDLED
0, RW
1 = Drive value of SPDLED bit onto LED_SPD output
0 = Normal operation
4
DRV_LNKLED
0, RW
1 = Drive value of LNKLED bit onto LED_LNK output
0 = Normal operation
3
DRV_ACTLED
0, RW
1 = Drive value of ACTLED bit onto LED_ACT/COL output
0 = Normal operation
2
SPDLED
0, RW
Value to force on LED_SPD output
1
LNKLED
0, RW
Value to force on LED_LNK output
0
ACTLED
0, RW
Value to force on LED_ACT/COL output
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| DP83849C_08 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:PHYTER? DUAL Commercial Temperature Dual Port 10/100 Mb/s Ethernet Physical Layer Transceiver |
| DP83849CVS | 功能描述:以太网 IC RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| DP83849CVS | 制造商:Texas Instruments 功能描述:TRANSCEIVER, ENET PHYTER, DUAL, 80TQFP 制造商:Texas Instruments 功能描述:TRANSCEIVER, ENET PHYTER, DUAL, 80TQFP; Data Rate:100Mbps; Ethernet Type:IEEE 802.3u; Supply Voltage Min:3V; Supply Voltage Max:3.6V; Digital IC Case Style:TQFP; No. of Pins:80; Interface Type:MII, RMII, Serial; Operating Temperature;RoHS Compliant: Yes |
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