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MACH220-15JC Datasheet(PDF) 6 Page - Advanced Micro Devices |
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MACH220-15JC Datasheet(HTML) 6 Page - Advanced Micro Devices |
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6 / 33 page  AMD 6 MACH220-10/12/15/20 FUNCTIONAL DESCRIPTION The MACH220 consists of eight PAL blocks connected by a switch matrix. There are 48 I/O pins and 4 dedicated input pins feeding the switch matrix. These signals are distributed to the four PAL blocks for efficient design implementation. There are 4 clock pins that can also be used as dedicated inputs. All inputs and I/O pins have built-in pull-up resistors. While it is always good design practice to tie unused pins high or low, the pull-up resistors provide design security and stability in the event that unused pins are left disconnected. The PAL Blocks Each PAL block in the MACH220 (Figure 1) contains a 48-product-term logic array, a logic allocator, 6 output macrocells, 6 buried macrocells, and 6 I/O cells. The switch matrix feeds each PAL block with 26 inputs. This makes the PAL block look effectively like an independ- ent “PAL26V12” with 6 buried macrocells. In addition to the logic product terms, two output enable product terms, an asynchronous reset product term, and an asynchronous preset product term are provided. One of the two output enable product terms can be chosen within each I/O cell in the PAL block. All flip-flops within the PAL block are initialized together. The Switch Matrix The MACH220 switch matrix is fed by the inputs and feedback signals from the PAL blocks. Each PAL block provides 12 internal feedback signals and 6 I/O feedback signals. The switch matrix distributes these signals back to the PAL blocks in an efficient manner that also provides for high performance. The design software automatically configures the switch matrix when fitting a design into the device. The Product-Term Array The MACH220 product-term array consists of 48 product terms for logic use, and 4 special-purpose product terms. Two of the special-purpose product terms provide programmable output enable, one provides asynchronous reset, and one provides asynchronous preset. The Logic Allocator The logic allocator in the MACH220 takes the 48 logic product terms and allocates them to the 12 macrocells as needed. Each macrocell can be driven by up to 16 product terms. The design software automatically configures the logic allocator when fitting the design into the device. Table 1 illustrates which product term clusters are available to each macrocell within a PAL block. Refer to Figure 1 for cluster and macrocell numbers. Table 1. Logic Allocation Available Output Buried Clusters M0 C0, C1, C2 M1 C0, C1, C2, C3 M2 C1, C2, C3, C4 M3 C2, C3, C4, C5 M4 C3, C4, C5, C6 M5 C4, C5, C6, C7 M6 C5, C6, C7, C8 M7 C6, C7, C8, C9 M8 C7, C8, C9, C10 M9 C8, C9, C10, C11 M10 C9, C10, C11 M11 C10, C11 Macrocell The Macrocell The MACH220 has two types of macrocell: output and buried. The output macrocells can be configured as either registered, latched, or combinatorial, with pro- grammable polarity. The macrocell provides internal feedback whether configured with or without the flip- flop. The registers can be configured as D-type or T-type, allowing for product-term optimization. The flip-flops can individually select one of four clock/gate pins, which are also available as data inputs. The registers are clocked on the LOW-to-HIGH transition of the clock signal. The latch holds its data when the gate input is HIGH, and is transparent when the gate input is LOW. The flip-flops can also be asynchronously initialized with the common asynchro- nous reset and preset product terms. The buried macrocells are the same as the output macrocells if they are used for generating logic. In that case, the only thing that distinguishes them from the output macrocells is the fact that there is no I/O cell connection, and the signal is only used internally. The buried macrocell can also be configured as an input register or latch. The I/O Cell The I/O cell in the MACH220 consists of a three-state output buffer. The three-state buffer can be configured in one of three ways: always enabled, always disabled, or controlled by a product term. If product term control is chosen, one of two product terms may be used to provide the control. The two product terms that are available are common to all I/O cells in a PAL block. These choices make it possible to use the macrocell as an output, an input, a bidirectional pin, or a three-state output for use in driving a bus. |
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