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SAB82525H-V21 Datasheet(PDF) 13 Page - Siemens Semiconductor Group |
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SAB82525H-V21 Datasheet(HTML) 13 Page - Siemens Semiconductor Group |
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13 / 126 page  Semiconductor Group 13 82525 82526 82525 82526 SAB SAB SAF SAF INT Pin Definitions and Functions (cont’d) Pin No. Symbol Input (I) Output (O) Function 30 29 I 34 31 AxCLK A AxCLK B I DMA Acknowledge (channel A/channel B) When low, this input signal from the DMA controller notifies, the HSCX, that the requested DMA cycle controlled via DRQxx (pins 37–40) is in progress, i.e. the DMA controller has achieved bus mastership from the CPU and will start data transfer cycles (either read or write). Together with RD, if DMA has been requested from the receiver, or with WR, if DMA has been requested from the transmitter, this input works like CS to enable a data byte to be read from or written to the top of the receive or transmit FIFO of the specified channel. If DACKn is active, the input on pins A0–A6 is ignored and the FIFOs are implicitly selected. If the DACKn signals are not used, these pins must be connected to V DD. Alternative Clock (channel A/channel B) These pins realize several input functions. Depending on the selected clock mode, they may supply either a This pin can be programmed to functions as receiver enable if the "auto start" feature is selected (CAS bit in XBCH set). The state at this pin can be read from VSTR register, or a receive strobe signal (clock mode 1) – or a frame synchronization signal in time-slot oriented operation mode (clock mode 5) – or, together with RxCLK, a crystal connection for the internal oscillator (clock mode 4, 6, 7, AxCLK A only). – CD (= Carrier Detect) modem control or general purpose input. – DACKA DACKB 28 oD Interrupt Request The signal is activated, when the HSCX requests an interrupt. The CPU may determine the particular source and cause of the interrupt by reading the HSCX’s interrupt status registers. (ISTA, EXIR). INT is an open drain output, thus the interrupt requests outputs of several HSCX’s can be connected to one interrupt input in a "wired-or" combination. This pin must be connected to a pull-up resistor. P-LCC P-MQFP 35 34 39 36 33 |
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