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參數(shù)資料

Si2494/39

Rev. 1.0

6. User-Access Registers (U-Registers)

U-Registers are 16-bit registers written by the AT:Uaa command and read by the AT:R (read all U-Registers) or

AT:Raa (read U-Register aa) commands (see the AT command list in Table 13 on page 46). Many aspects of the

modem’s and DAA’s behavior can be enabled/disabled, configured, monitored, and/or modified through U-

Registers; however, most of them will not be needed in normal use.

There are two types of U-Registers. The first represents a single 16-bit term, such as a filter coefficient, threshold,

delay, or other quantity. These registers can be read from or written to as a single 16-bit value. The second type of

U-Register is bit-mapped. Bit-mapped registers are written and/or read in hexadecimal, but each bit or combination

of bits in the register represents an independent value or status information. These individual bits are used to

enable or disable features and indicate states.

Some U-Registers are reserved and not available to the user. Therefore, there are gaps in the available U-Register

address map. Additionally, some bits within available U-Registers are reserved. Any attempt to write a non-zero

value to a reserved U-Register or bit may cause unpredictable modem operation.

With over 100 U-Registers, the Si2494/39 offers an unprecedented level of programmability for a controller-based

modem. A detailed list of these registers and their use is beyond the scope of this data sheet. Refer to “AN93:

ISOmodem Chipset Family Designer’s Guide” for details.

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
SI2439-A-GMR	制造商:Silicon Laboratories Inc 功能描述:33.6 KBPS ISOMODEM + VOICE - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC ISOMODEM 33.6KBPS 38-QFN
SI2456	制造商:SILABS 制造商全稱:SILABS 功能描述:V.90, V.34, V.32BIS ISOMODEM⑩ WITH INTEGRATED GLOBAL DAA
SI2456-FT	制造商:Silicon Laboratories Inc 功能描述:MODEM CHIP CHIPSET ISOMODEM 56KBPS 24TSSOP - Rail/Tube
SI2456-FT/REV F	制造商:Silicon Laboratories Inc 功能描述:NOT RECOMMENDED FOR NEW DESIGNS, SEE SI2457-FT - Rail/Tube
Si2456-FTR	制造商:Silicon Laboratories Inc 功能描述:MODEM CHIP CHIPSET ISOMODEM 56KBPS 24TSSOP - Tape and Reel

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