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GAL16V8 Datasheet(PDF) 10 Page - ATMEL Corporation |
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GAL16V8 Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 26 page 10 0364J–PLD–7/05 ATF16V8B/BQ/BQL 11.1 ATF16V8B Registered Mode PAL Device Emulation/PAL Replacement. The registered mode is used if one or more regis- ters are required. Each macrocell can be configured as either a registered or combinatorial output or I/O, or as an input. For a registered output or I/O, the output is enabled by the OE pin, and the register is clocked by the CLK pin. Eight product terms are allocated to the sum term. For a combinatorial output or I/O, the output enable is controlled by a product term, and seven product terms are allocated to the sum term. When the macrocell is configured as an input, the output enable is permanently disabled. Any register usage will make the compiler select this mode. The following registered devices can be emulated using this mode: 16R8 16RP8 16R6 16RP6 16R4 16RP4 Figure 11-1. Registered Configuration for Registered Mode (1)(2) Notes: 1. Pin 1 controls common CLK for the registered outputs. Pin 11 controls common OE for the reg- istered outputs. Pin 1 and Pin 11 are permanently configured as CLK and OE. 2. The development software configures all the architecture control bits and checks for proper pin usage automatically. Figure 11-2. Combinatorial Configuration for Registered Mode (1)(2) Notes: 1. Pin 1 and Pin 11 are permanently configured as CLK and OE. 2. The development software configures all the architecture control bits and checks for proper pin usage automatically. |
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Similar Description - GAL16V8 |
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