SMSC LAN9312 - Manual (Page 302)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 302 SMSC LAN9312
DATASHEET
14.4.2.10 Port x PHY Special Control/Status Indication Register (PHY_SPECIAL_CONTROL_STAT_IND_x)
This read/write register is used to control various options of the Port x PHY.
Note 14.61 Register bits designated as NASR are reset when the Port x PHY Reset is generated via
the
Reset Control Register (RESET_CTL) . The NASR designation is only applicable when
t h e R e s e t ( P H Y _ R S T ) b i t o f t h e P o r t x P H Y B a s i c C o n t r o l R e g i s t e r
(PHY_BASIC_CONTROL_x) is set.
Index (decimal): 27 Size: 16 bits
BITS DESCRIPTION TYPE DEFAULT
15 Auto-MDIX Control (AMDIXCTRL)
This bit is responsible for determining the source of Auto-MDIX control for
Port x. When set, the Manual MDIX and Auto MDIX straps
(manual_mdix_strap_1/auto_mdix_strap_1 for Port 1 PHY,
manual_mdix_strap_2/auto_mdix_strap_2 for Port 2 PHY) are overridden,
and Auto-MDIX functions are controlled using bit 14 (AMDIXEN) and bit 13
(AMDIXSTATE) of this register. When cleared, Auto-MDIX functionality is
controlled by the Manual MDIX and Auto MDIX straps by default. Refer to
Section 4.2.4, "Configuration Straps," on page 40 for configuration strap
definitions.
0: Port x Auto-MDIX determined by strap inputs
1: Port x Auto-MDIX determined by bits 14 and 13
R/W
NASR
Note 14.61
0b
14 Auto-MDIX Enable (AMDIXEN)
When bit 15 (AMDIXCTRL) of this register is set, this bit is used in
conjunction with bit 13 (Auto-MDIX State) to control the Port x Auto-MDIX
functionality as shown in
Table 14.11 .
R/W
NASR
Note 14.61
0b
13 Auto-MDIX State (AMDIXSTATE)
When bit 15 (AMDIXCTRL) of this register is set, this bit is used in
conjunction with bit 14 (Auto-MDIX Enable) to control the Port x Auto-MDIX
functionality as shown in
Table 14.11 .
R/W
NASR
Note 14.61
0b
12 RESERVED RO -
11 SQE Test Disable (SQEOFF)
This bit controls the disabling of the SQE test (Heartbeat). SQE test is
enabled by default.
0: SQE test enabled
1: SQE test disabled
R/W
NASR
Note 14.61
0b
10 Receive PLL Lock Control (VCOOFF_LP)
This bit controls the locking of the receive PLL. Setting this bit to 1 forces
the receive PLL 10M to lock on the reference clock at all times. When in this
mode, 10M data packets cannot be received.
0: Receive PLL 10M can lock on reference or line as needed (normal
operation)
1: Receive PLL 10M locked onto reference clock at all times
R/W
NASR
Note 14.61
0b
9:5 RESERVED RO -
4 10Base-T Polarity State (XPOL)
This bit shows the polarity state of the 10Base-T.
0: Normal Polarity
1: Reversed Polarity
RO 0b
3:0 RESERVED RO -