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CY7B994V-5BBC Datasheet(PDF) 7 Page - Cypress Semiconductor |
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CY7B994V-5BBC Datasheet(HTML) 7 Page - Cypress Semiconductor |
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7 / 18 page  RoboClock CY7B993V, CY7B994V Document #: 38-07127 Rev. *J Page 7 of 18 Time Unit Definition Selectable skew is in discrete increments of time unit (tU). The value of a tU is determined by the FS setting and the maximum nominal output frequency. The equation to be used to determine the tU value is as follows: tU = 1/(fNOM*N) N is a multiplication factor which is determined by the FS setting. fNOM is nominal frequency of the device. N is defined in Table 3. Divide and Phase Select Matrix The Divide and Phase Select Matrix is comprised of five independent banks: four banks of clock outputs and one bank for feedback. Each clock output bank has two pairs of low-skew, high-fanout output buffers ([1:4]Q[A:B][0:1]), two phase function select inputs ([1:4]F[0:1]), two divider function selects ([1:4]DS[0:1]), and one output disable (DIS[1:4]). The feedback bank has one pair of low-skew, high-fanout output buffers (QFA[0:1]). One of these outputs may connect to the selected feedback input (FBK[A:B]±). This feedback bank also has one phase function select input (FBF0), two divider function selects FSDS[0:1], and one output disable (FBDIS). The phase capabilities that are chosen by the phase function select pins are shown in Table 4. The divide capabilities for each bank are shown in Table 5. Figure 3 illustrates the timing relationship of programmable skew outputs. All times are measured with respect to REF with the output used for feedback programmed with 0tU skew. The PLL naturally aligns the rising edge of the FB input and REF input. If the output used for feedback is programmed to another skew position, then the whole tU matrix shifts with respect to REF. For example, if the output used for feedback is programmed to shift –8tU, then the whole matrix is shifted forward in time by 8tU. Thus an output programmed with 8tU of skew is effectively skewed 16tU with respect to REF. Table 2. Frequency Range Select FS[2] CY7B993V CY7B994V fNOM (MHz) fNOM (MHz) Min Max Min Max LOW 1226 2452 MID 24 52 48 100 HIGH 48 100 96 200 Table 3. N Factor Determination FS CY7B993V CY7B994V N fNOM (MHz) at which tU =1.0 ns N fNOM (MHz) at which tU =1.0 ns LOW 64 15.625 32 31.25 MID 32 31.25 16 62.5 HIGH 16 62.5 8 125 Table 4. Output Skew Select Function Function Selects Output Skew Function [1:4]F1 [1:4]F0 and FBF0 Bank1 Bank2 Bank3 Bank4 Feed- back Bank LOW LOW –4tU –4tU –8tU –8tU –4tU LOW MID –3tU –3tu –7tU –7tU NA LOW HIGH –2tU –2tU –6tU –6tU NA MID LOW –1tU –1tU BK1[3] BK1[3] NA MID MID 0tU 0tU 0tU 0tU 0tu MID HIGH +1tU +1tU BK2[3] BK2[3] NA HIGH LOW +2tU +2tU +6tU +6tU NA HIGH MID +3tU +3tU +7tU +7tU NA HIGH HIGH +4tU +4tU +8tU +8tU +4tU Table 5. Output Divider Function Function Selects Output Divider Function [1:4]DS1 and FBDS1 [1:4]DS0 and FBDS0 Bank1 Bank2 Bank3 Bank4 Feed- back Bank LOW LOW /1 /1 /1 /1 /1 LOW MID /2 /2 /2 /2 /2 LOW HIGH /3 /3 /3 /3 /3 MID LOW /4 /4 /4 /4 /4 MID MID /5 /5 /5 /5 /5 MID HIGH /6 /6 /6 /6 /6 HIGH LOW /8 /8/8/8 /8 HIGH MID /10 /10 /10 /10 /10 HIGH HIGH /12 /12 /12 /12 /12 Notes 2. The level to be set on FS is determined by the “nominal” operating frequency (fNOM) of the VCO and Phase Generator. fNOM always appears on an output when the output is operating in the undivided mode. The REF and FB are at fNOM when the output connected to FB is undivided. 3. BK1, BK2 denotes following the skew setting of Bank1 and Bank2, respectively. [+] Feedback |
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