TMS320C6203B
FIXED POINT DIGITAL SIGNAL PROCESSOR
SPRS086K – JANUARY 1999 – REVISED APRIL 2003
XHOLD/XHOLDA TIMING
timing requirements for expansion bus arbitration (internal arbiter enabled)† (see Figure 45)
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-300 |
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3 |
toh(XHDAH-XHDH) Output hold time, XHOLD high after XHOLDA high |
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ns |
† P = 1/CPU clock frequency in ns. For example, when running parts at 300 MHz, use P = 3.3 ns.
switching characteristics over recommended operating conditions for expansion bus arbitration (internal arbiter enabled)†‡ (see Figure 45)
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-250 |
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PARAMETER |
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-300 |
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1 |
td(XHDH-XBHZ) |
Delay time, XHOLD high to XBus high impedance |
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3P |
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ns |
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2 |
td(XBHZ-XHDAH) |
Delay time, XBus high impedance to XHOLDA high |
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0 |
2P |
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4 |
td(XHDL-XHDAL) |
Delay time, XHOLD low to XHOLDA low |
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3P |
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5 |
td(XHDAL-XBLZ) |
Delay time, XHOLDA low to XBus low impedance |
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0 |
2P |
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† P = 1/CPU clock frequency in ns. For example, when running parts at 300 MHz, use P = 3.3 ns. |
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‡ XBus consists of XBE[3:0]/XA[5:2], XAS, XW/R, and XBLAST. |
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§ All pending XBus transactions are allowed to complete before XHOLDA is asserted. |
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DSP Owns Bus |
External Requestor |
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DSP Owns Bus |
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Owns Bus |
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XHOLD (input) |
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3 |
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2 |
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XHOLDA (output) |
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XBus† |
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1 |
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5 |
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C6203B |
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C6203B |
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† XBus consists of XBE[3:0]/XA[5:2], XAS, XW/R, and XBLAST.
Figure 45. Expansion Bus Arbitration—Internal Arbiter Enabled
80 |
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 |
TMS320C6203B
FIXED POINT DIGITAL SIGNAL PROCESSOR
SPRS086K – JANUARY 1999 – REVISED APRIL 2003
XHOLD/XHOLDA TIMING (CONTINUED)
switching characteristics over recommended operating conditions for expansion bus arbitration (internal arbiter disabled)† (see Figure 46)
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-250 |
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NO. |
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PARAMETER |
-300 |
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UNIT |
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MIN |
MAX |
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1 |
t |
Delay time, XHOLDA high to XBus low impedance‡ |
2P |
2P + 10 |
ns |
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d(XHDAH-XBLZ) |
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2 |
td(XBHZ-XHDL) |
Delay time, XBus high impedance to XHOLD low‡ |
0 |
2P |
ns |
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† P = 1/CPU clock frequency in ns. For example, when running parts at 300 MHz, use P = 3.3 ns. |
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‡ XBus consists of XBE[3:0]/XA[5:2], XAS, XW/R, and XBLAST. |
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XHOLD (output) |
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2 |
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XHOLDA (input) |
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1 |
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XBus† |
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C6203B |
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† XBus consists of XBE[3:0]/XA[5:2], XAS, XW/R, and XBLAST.
Figure 46. Expansion Bus Arbitration—Internal Arbiter Disabled
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 |
81 |