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IMP8980DC Datasheet(PDF) 3 Page - IMP, Inc |
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IMP8980DC Datasheet(HTML) 3 Page - IMP, Inc |
3 / 14 page 3 stream into active Message Mode; i.e., the contents of the Connection Memory Low are output on the ST-BUS output streams once every frame unless the ODE pin is low. In this mode the chip behaves as if bits 2 and 0 of every Connection Memory High location were 1, regardless of the actual values. If bit 6 of the Control Register is 0, then bits 2 and 0 of each Connection Memory Figure 3- Address Memory Map A5 A4 A3 A2 A1 A0 HEX ADDRESS LOCATION 0 X X X X X 00-1F Control Register* 1 0 0 0 0 0 20 Channel 0† 1 0 0 0 0 1 21 Channel 1† GG G G G G G G GG G G G G G G GG G G G G G G 1 1 1 1 1 1 3F Channel 31† * Writing to the Control Register is the only fast transaction. † Memory and stream are specified by the contents of the Control Register. High location function normally (see Figure 5). If bit 2 is 1, the associated ST- BUS output channel is in Message Mode; i.e., the byte in the corresponding Connec- tion Memory Low location is transmitted on the stream at that channel. Otherwise, one of the bytes received on the serial inputs is transmitted and the contents of the Connection Memory Low define the ST-BUS input stream and channel where the byte is to be found (see Figure 6). Figure 4 - Control Register Bits 76 54 32 10 Mode Control Bits (Unused) Memory Select Bits Stream Address Bits BIT NAME DESCRIPTION 7 Split When 1, all subsequent reads are from the Data Memory Memory and writes are to the Connection Memory Low, except when the Control Register is accessed again. When 0, the Memory Select bits specify the memory for subsequent operations. In either case, the Stream Address Bits select the subsection of the memory which is made available. 6 Message When 1, the contents of the Connection Memory Low are output Mode on the Serial Output streams except when the ODE pin is low. When 0, the Connection Memory bits for each channel determine what is output. 5 (unused) 4-3 Memory 0-0 - Not to be used Select Bits 0-1 - Data Memory (read only from the microprocessor port) 1-0 - Connection Memory Low 1-1 - Connection Memory High 2-0 Stream The number expressed in binary notation on these bits refers to Address the input or output ST-BUS stream which corresponds to the Bits subsection of memory made accessible for subsequent operations. |
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