diff options
Diffstat (limited to 'include/configs/TQM885D.h')
| -rw-r--r-- | include/configs/TQM885D.h | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/include/configs/TQM885D.h b/include/configs/TQM885D.h index f36b729cd5e..a8fbbfbbf83 100644 --- a/include/configs/TQM885D.h +++ b/include/configs/TQM885D.h @@ -434,26 +434,30 @@ #define CFG_PTA_PER_CLK ((4096 * 64 * 1000) / (4 * 64)) /* - * Memory Periodic Timer Prescaler - * Periodic timer for refresh, start with refresh rate for 40 MHz clock - * (CFG_8xx_CPUCLK_MIN / CFG_PTA_PER_CLK) + * Periodic timer (MAMR[PTx]) for 4 * 7.8 us refresh (= 31.2 us per quad) + * + * CPUclock(MHz) * 31.2 + * CFG_MAMR_PTA = ----------------------------------- with DFBRG = 0 + * 2^(2*SCCR[DFBRG]) * MPTPR_PTP_DIV16 + * + * CPU clock = 15 MHz: CFG_MAMR_PTA = 29 -> 4 * 7.73 us + * CPU clock = 50 MHz: CFG_MAMR_PTA = 97 -> 4 * 7.76 us + * CPU clock = 66 MHz: CFG_MAMR_PTA = 128 -> 4 * 7.75 us + * CPU clock = 133 MHz: CFG_MAMR_PTA = 255 -> 4 * 7.67 us + * + * Value 97 is for 4 * 7.8 us at 50 MHz. So the refresh cycle requirement will + * be met also in the default configuration, i.e. if environment variable + * 'cpuclk' is not set. */ -#define CFG_MAMR_PTA 39 +#define CFG_MAMR_PTA 128 /* - * For 16 MBit, refresh rates could be 31.3 us - * (= 64 ms / 2K = 125 / quad bursts). - * For a simpler initialization, 15.6 us is used instead. - * - * #define CFG_MPTPR_2BK_2K MPTPR_PTP_DIV32 for 2 banks - * #define CFG_MPTPR_1BK_2K MPTPR_PTP_DIV64 for 1 bank + * Memory Periodic Timer Prescaler Register (MPTPR) values. */ -#define CFG_MPTPR_2BK_4K MPTPR_PTP_DIV16 /* setting for 2 banks */ -#define CFG_MPTPR_1BK_4K MPTPR_PTP_DIV32 /* setting for 1 bank */ - -/* refresh rate 7.8 us (= 64 ms / 8K = 31.2 / quad bursts) for 256 MBit */ -#define CFG_MPTPR_2BK_8K MPTPR_PTP_DIV8 /* setting for 2 banks */ -#define CFG_MPTPR_1BK_8K MPTPR_PTP_DIV16 /* setting for 1 bank */ +/* 4 * 7.8 us refresh (= 31.2 us per quad) at 50 MHz and PTA = 97 */ +#define CFG_MPTPR_2BK_4K MPTPR_PTP_DIV16 +/* 4 * 3.9 us refresh (= 15.6 us per quad) at 50 MHz and PTA = 97 */ +#define CFG_MPTPR_2BK_8K MPTPR_PTP_DIV8 /* * MAMR settings for SDRAM |