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TP8044AH-R0117 数据表(PDF) 45 Page - InnovASIC, Inc |
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TP8044AH-R0117 数据表(HTML) 45 Page - InnovASIC, Inc |
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45 / 65 page ![]() IA8044/IA8344 Data Sheet SDLC Communications Controller March 30, 2010 IA211010112-04 http://www.Innovasic.com UNCONTROLLED WHEN PRINTED OR COPIED Customer Support: Page 45 of 65 1-888-824-4184 ® The no-control field format is only supported by the FLEXIBLE mode. In this format, TCB and RCB are not used and the information field starts immediately after the address field. A control field may still be used in the frame but the SIU will treat it as a byte of the information field. The no-control field and no-address field formats are supported only by the FLEXIBLE mode. In this format STAD, TCB, and RCB are not used and the information field starts immediately after the opening flag. This option can only be used with the no-control field option. A control field and address field may still be used in the frame but the SIU will treat each as a byte of the information field. The no FCS field format prevents an FCS from being generated during transmission or being checked during reception. This option may be used in conjunction with the other frame format options. This option will work with both FLEXIBLE and AUTO modes. In AUTO mode, it could cause protocol violations. An FCS field may still be used in the frame but the SIU will treat it as a byte of the information field. All the possible Frame Format combinations are presented in Table 47, along with the bit settings that select a given format. Table 47. Frame Format Options Frame Option NFCS NB AM Frame Format Standard SDLC FLEXIBLE Mode 0 0 0 Fl Ad Co Inf FCS Fl Standard SDLC AUTO Mode 0 0 1 Fl Ad Co Inf FCS Fl No-Control Field FLEXIBLE Mode 0 1 1 Fl Ad Inf FCS Fl No-Control Field No-Address Field FLEXIBLE Mode 0 1 0 Fl Inf FCS Fl No-FCS Field FLEXIBLE Mode 1 0 0 Fl Ad Co Inf Fl No-FCS Field AUTO Mode 1 0 1 Fl Ad Co Inf Fl |
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