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CY3732VP400200AXC Datasheet(PDF) 5 Page - Cypress Semiconductor |
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CY3732VP400200AXC Datasheet(HTML) 5 Page - Cypress Semiconductor |
5 / 64 page Ultra37000 CPLD Family Document #: 38-03007 Rev. *E Page 5 of 64 The buried macrocell also supports input register capability. The buried macrocell can be configured to act as an input register (D-type or latch) whose input comes from the I/O pin associated with the neighboring macrocell. The output of all buried macrocells is sent directly to the PIM regardless of its configuration. I/O Macrocell Figure 2 illustrates the architecture of the I/O macrocell. The I/O macrocell supports the same functions as the buried macrocell with the addition of I/O capability. At the output of the macrocell, a polarity control mux is available to select active LOW or active HIGH signals. This has the added advantage of allowing significant logic reduction to occur in many appli- cations. The Ultra37000 macrocell features a feedback path to the PIM separate from the I/O pin input path. This means that if the macrocell is buried (fed back internally only), the associated I/O pin can still be used as an input. Bus Hold Capabilities on all I/Os Bus-hold, which is an improved version of the popular internal pull-up resistor, is a weak latch connected to the pin that does not degrade the device’s performance. As a latch, bus-hold maintains the last state of a pin when the pin is placed in a high-impedance state, thus reducing system noise in bus-interface applications. Bus-hold additionally allows unused device pins to remain unconnected on the board, which is particularly useful during prototyping as designers can route new signals to the device without cutting trace connec- tions to VCC or GND. For more information, see the application note Understanding Bus-Hold—A Feature of Cypress CPLDs. Programmable Slew Rate Control Each output has a programmable configuration bit, which sets the output slew rate to fast or slow. For designs concerned with meeting FCC emissions standards the slow edge provides for lower system noise. For designs requiring very high perfor- mance the fast edge rate provides maximum system perfor- mance. C2 C3 DECODE C2 C3 DECODE 0 1 2 3 O C6 C5 “0” “1” 0 1 O D/T/L Q R P 0 1 2 3 O C0 0 1 O C4 FEEDBACK TO PIM FEEDBACK TO PIM BLOCK RESET 0 −16 TERMS I/O MACROCELL I/O CELL FROM PTM 0 1 O D/T/L Q R P FROM PTM 1 O C7 FEEDBACK TO PIM BURIED MACROCELL 0 ASYNCHRONOUS PRODUCT 0 −16 TERMS PRODUCT C1 4 0 1 2 3 Q 4 C24 C0 C1 C24 C25 C25 4 SYNCHRONOUS CLOCKS (CLK0,CLK1,CLK2,CLK3) 1 ASYNCHRONOUS CLOCK(PTCLK) BLOCK PRESET ASYNCHRONOUS FAST SLOW C26 SLEW 0 1 0 1 0 1 0 1 OE0 OE1 Figure 2. I/O and Buried Macrocells |
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