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| SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005 |
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| Terminal Functions (Continued) |
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| PIN |
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| SIGNAL | NO. |
| TYPE† |
| IPD/ |
| DESCRIPTION |
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| NAME | GDP/ |
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| IPU‡ |
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| ZDP |
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| EMIF − CONTROL SIGNALS COMMON TO ALL TYPES OF MEMORY ¶ (CONTINUED) |
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| HRDY |
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| H19 |
| O |
| IPD | Host ready (from DSP to host) |
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| V6 |
| O/Z |
| IPU |
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| CE3 |
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| Memory space enables |
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| CE2 | W6 |
| O/Z |
| IPU |
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| • Enabled by bits 28 through 31 of the word address |
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| CE1 | W18 |
| O/Z |
| IPU |
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| • Only one asserted during any external data access |
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| V17 |
| O/Z |
| IPU |
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| CE0 |
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| V5 |
| O/Z |
| IPU |
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| BE3 |
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| Y4 |
| O/Z |
| IPU |
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| BE2 |
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| • Decoded from the two lowest bits of the internal address |
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| U19 |
| O/Z |
| IPU | • |
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| BE1 |
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| • Can be directly connected to SDRAM read and write mask signal (SDQM) |
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| BE0 | V20 |
| O/Z |
| IPU |
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| EMIF − BUS ARBITRATION ¶ |
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| HOLDA |
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| J18 |
| O |
| IPU |
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| J17 |
| I |
| IPU | Hold request from the host |
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| HOLD |
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| BUSREQ | J19 |
| O |
| IPU | Bus request output |
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| EMIF − ASYNCHRONOUS/SYNCHRONOUS MEMORY CONTROL ¶ |
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| ECLKIN | Y11 |
| I |
| IPD | External EMIF input clock source |
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| EMIF output clock depends on the EKSRC bit (DEVCFG.[4]) and on EKEN bit (GBLCTL.[5]) |
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| EKSRC = 0 | – ECLKOUT is based on the internal SYSCLK3 signal |
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| from the clock generator (default). |
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| ECLKOUT | Y10 |
| O/Z |
| IPD | EKSRC = 1 | – ECLKOUT is based on the the external EMIF input clock |
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| source pin (ECLKIN) |
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| EKEN = 0 | – ECLKOUT held low |
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| EKEN = 1 | – ECLKOUT enabled to clock (default) |
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| ARE/SDCAS/ | V11 |
| O/Z |
| IPU | Asynchronous memory read enable/SDRAM |
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| SSADS |
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| AOE/SDRAS/ | W10 |
| O/Z |
| IPU | Asynchronous memory output enable/SDRAM |
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| SSOE |
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| AWE/SDWE/ | V12 |
| O/Z |
| IPU | Asynchronous memory write enable/SDRAM write enable/SBSRAM write enable |
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| SSWE |
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| ARDY | Y5 |
| I |
| IPU | Asynchronous memory ready input |
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†I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal (PLL Filter)
‡ IPD = Internal pulldown, IPU = Internal pullup. [To oppose the supply rail on these IPD/IPU signal pins, use external pullup or pulldown resistors no greater than 4.4 kΩ and 2.0 kΩ, respectively.]
¶ To maintain signal integrity for the EMIF signals, serial termination resistors should be inserted into all EMIF output signal lines.
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 | 27 |