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ST75C540 数据表(PDF) 44 Page - STMicroelectronics |
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ST75C540 数据表(HTML) 44 Page - STMicroelectronics |
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44 / 84 page  VIII.1.3 - CR Command Issuing a CR command causes the ST75C530/540 to dump a specific memory location in complex mode. This instruction is particularly useful for equalizer state analysis or for software eye-pattern display. The report area has this meaning : RP7 RP6 RP5 RP4 RP3 RP2 RP1 RP0 COMREP[0] IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0 COMREP[1] RP0..RP7 is the MSB part of the 16-bit value of the real part and IP0..IP7is the MSB part of the imaginary part. The CR command insures that the real and imaginary part of the desired complex value are sampled internally at the same time. The address given in the parameter field of CR is the address of the real part. VIII.1.4 - MR/TDRC/TDRW/IDT/MRI/MRLO Commands The report issued by the MR/TDRC/TDRW/IDT/MRI/MRLO commands follow the same rules as for CR. The report meaning is : D7 D6 D5 D4 D3 D2 D1 D0 COMREP[0] D15 D14 D13 D12 D11 D10 D9 D8 COMREP[1] D0..D15 is the 16-bit value requested by the command. In the case of IDT,D15..D12 containsthe productidentification(3 for ST75C530,7 for ST75C5540), D11..D8 contains the hardware revision identification and D7..D0 contains the software revision identification. VIII.2 - Modem Status VIII.2.1 - Modem Status Description The Status of ST75C530/540 is divided into 4 fields : - The error status byte SYSERR that provides information about error. This status can trigger an IT0 interrupt, - The general status byte STATUS[0] and STATUS[1] that contains all the modem signals. These status bytes can trigger an IT4 interrupt, - The quality status STAQUA, that contains the quality of the received transmission, - The optional status bytes STAOP[0], STAOP[1], STAOP[2] and STAOP[3], that contains additional information regarding the ST75C530/540 operating mode. This default information can be changed to monitor any internal variables using the DOSR command. All these informations are updated on a Baud basis : Mode Baud Rate (2) (Hz) V.32bis/V.32 (ST75C540 only) 2400 V.22bis/V.22/Bell 212A (ST75C540 only) 2400 Tone 2400 Bell 103 (full duplex) 2400 V.21 (full duplex) 2400 V.23 (full duplex) 2400 V.27ter 2400bps 1200 V.27ter 4800bps 1600 (1) V.29 2400 V.17/V.33 2400 V.21 channel 2 2400 HANDSET, CODER or DECODER Modes 1200 Notes : 1. In this mode the tone detectors outputs are update 800 times by second. 2. This baud rate defines also, the maximum command rate. Each baud time the ST75C530/540 looks at the COMSYS location (Address $00) to see if a command have been sent by the host processor. If the content of this location is different from zero the ST75C530/540 execute the command. VIII - STATUS DESCRIPTION (continued) ST75C530 - ST75C540 44/84 |
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