lan9312 Standard Microsystems Corp., lan9312 Datasheet - Page 56
lan9312
Manufacturer Part Number
lan9312
Description
Lan9312 High Performance Two Port 10/100 Managed Ethernet Switch With 32-bit Non-pci Cpu Interface
Manufacturer
Standard Microsystems Corp.
Datasheet
1.LAN9312.pdf
(458 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
lan9312-NU
Manufacturer:
Microchip Technology
Quantity:
10 000
Company:
Part Number:
lan9312-NZW
Manufacturer:
Standard
Quantity:
143
Company:
Part Number:
lan9312-NZW
Manufacturer:
Microchip Technology
Quantity:
10 000
- Current page: 56 of 458
- Download datasheet (6Mb)
High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
6.2.1
Switch Fabric CSR Writes
To perform a write to an individual switch fabric register, the desired data must first be written into the
Switch Fabric CSR Interface Data Register
(SWITCH_CSR_DATA). The write cycle is initiated by
p e r f o r m i n g a s i n g l e w r i t e t o t h e
S w i t c h F a b r i c C S R I n t e r f a c e C o m m a n d R e g i s t e r
(SWITCH_CSR_CMD)
with CSR_BUSY (bit 31) set, the CSR_ADDRESS field (bits 15:0) set to the
desired register address, the R_nW (bit 30) cleared, the AUTO_INC and AUTO_DEC fields cleared,
and the desired CSR byte enable bits selected (bits 19:16). The completion of the write cycle is
indicated by the clearing of the CSR_BUSY bit.
A second write method may be used which utilizes the auto increment/decrement function of the
Switch Fabric CSR Interface Command Register (SWITCH_CSR_CMD)
for writing sequential register
addresses. When using this method, the
Switch Fabric CSR Interface Command Register
(SWITCH_CSR_CMD)
must first be written with the auto increment(AUTO_INC) or auto
decrement(AUTO_DEC) bit set, the CSR_ADDRESS field written with the desired register address, the
R_nW bit cleared, and the desired CSR byte enable bits selected (typically all set). The write cycles
are then initiated by writing the desired data into the
Switch Fabric CSR Interface Data Register
(SWITCH_CSR_DATA). The completion of the write cycle is indicated by the clearing of the
CSR_BUSY bit, at which time the address in the
Switch Fabric CSR Interface Command Register
(SWITCH_CSR_CMD)
is incremented or decremented accordingly. The user may then initiate a
subsequent write cycle by writing the desired data into the
Switch Fabric CSR Interface Data Register
(SWITCH_CSR_DATA).
The third write method is to use the direct data range write function. Writes within the
Switch Fabric
CSR Interface Direct Data Register (SWITCH_CSR_DIRECT_DATA)
address range automatically set
the appropriate register address, set all four byte enable bits (CSR_BE[3:0]), clears the R_nW bit, and
s e t s t h e C S R _ B U S Y b i t o f t h e
S w i t c h F a b r i c C S R I n t e r f a c e C o m m a n d R e g i s t e r
(SWITCH_CSR_CMD). The completion of the write cycle is indicated by the clearing of the
CSR_BUSY bit. Since the address range of the switch fabric CSRs exceeds that of the
Switch Fabric
CSR Interface Direct Data Register (SWITCH_CSR_DIRECT_DATA)
address range, a sub-set of the
switch fabric CSRs are mapped to the
Switch Fabric CSR Interface Direct Data Register
(SWITCH_CSR_DIRECT_DATA)
address range as detailed in
Table 14.3, “Switch Fabric CSR to
SWITCH_CSR_DIRECT_DATA Address Range Map,” on page
240.
Figure 6.1
illustrates the process required to perform a switch fabric CSR write. The minimum wait
periods as specified in
Table 8.1, “Read After Write Timing Rules,” on page 101
are required where
noted.
Revision 1.2 (04-08-08)
56
SMSC LAN9312
DATASHEET
Related parts for lan9312
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Interface, Integrated USB2.0 Compatible 3-Port Hub
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Lan91c100fd Rev. B Feast Fast Ethernet Controller With Full Duplex Capability
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Feast ? Ast Ethernet Controller
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Com20022i 10 Mbps Arcnet Ansi 878.1 Controller With 2k X 8 On-chip Ram
Manufacturer:
Standard Microsystems Corp.
Part Number:
Description:
Lpc47n207 Lpc Super I/o Irda Hot Docking Chip With Uart Data Brief
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Advanced I/o With X-bus Interface
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Fdc37m707 Enhanced Super I/o Controller With Wake-up Features
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Twenty Pin Uart Tpuart Corporation
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Enhanced Small Device Interface Controller
Manufacturer:
Standard Microsystems Corp.
Part Number:
Description:
Rpm-based Pwm Fan Controller
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Rpm-based Pwm Fan Controller
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
Emc1001 1.5?c Smbus Temperature Sensor In Miniature Sot-23
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
1 Degree C Triple Temperature Sensor With Beta Compensation And Hotter Of Two Zones
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
1 Degree C Multiple Temperature Sensor With Beta Compensation And Hottest Of Thermal Zones
Manufacturer:
Standard Microsystems Corp.
Datasheet:
Part Number:
Description:
1 Degree C Triple Temperature Sensor With Resistance Error Correction & Hotter Of Two Zones
Manufacturer:
Standard Microsystems Corp.
Datasheet: