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W83977EF-AW Datasheet(PDF) 67 Page - Winbond |
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W83977EF-AW Datasheet(HTML) 67 Page - Winbond |
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67 / 142 page  W83977EF-AW/W83977EG-AW Publication Release Date: Apr. 2006 -65- Revision 1.2 7.3.12 ECP Pin Descriptions NAME TYPE DESCRIPTION nStrobe (HostClk) O The nStrobe registers data or address into the slave on the asserting edge during write operations. This signal handshakes with Busy. PD<7:0> I/O These signals contains address or data or RLE data. nAck (PeriphClk) I This signal indicates valid data driven by the peripheral when asserted. This signal handshakes with nAutoFd in reverse. Busy (PeriphAck) I This signal deasserts to indicate that the peripheral can accept data. It indicates whether the data lines contain ECP command information or data in the reverse direction. When in reverse direction, normal data are transferred when Busy (PeriphAck) is high and an 8-bit command is transferred when it is low. PError (nAckReverse) I This signal is used to acknowledge a change in the direction of the transfer (asserted = forward). The peripheral drives this signal low to acknowledge nReverseRequest. The host relies upon nAckReverse to determine when it is permitted to drive the data bus. Select (Xflag) I Indicates printer on line. nAutoFd (HostAck) O Requests a byte of data from the peripheral when it is asserted. This signal indicates whether the data lines contain ECP address or data in the forward direction. When in forward direction, normal data are transferred when nAutoFd (HostAck) is high and an 8-bit command is transferred when it is low. nFault (nPeriphRequest) I Generates an error interrupt when it is asserted. This signal is valid only in the forward direction. The peripheral is permitted (but not required) to drive this pin low to request a reverse transfer during ECP Mode. nInit (nReverseRequest) O This signal sets the transfer direction (asserted = reverse, deasserted = forward). This pin is driven low to place the channel in the reverse direction. nSelectIn (ECPMode) O This signal is always deasserted in ECP mode. |
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