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STPC12HDYI 数据表(PDF) 33 Page - STMicroelectronics |
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STPC12HDYI 数据表(HTML) 33 Page - STMicroelectronics |
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33 / 111 page  STRAP OPTION Issue 1.0 - July 24, 2002 33/111 3. STRAP OPTION This chapter defines the STPC Atlas Strap Options and their locations. Some strap options are left programmable for future versions of silicon. The strap options are sampled at a specific point of the boot process. This is shown in detail in Figure 4-3 Signal Designation Location Actual Settings Set to ’0’ Set to ’1’ MD1 Reserved2 Not accessible Pull Up - - MD2 HCLK Speed Index 5F,bit 6 User defined See Section 3.1.3. MD3 Index 5F,bit 7 User defined MD[4] PCI_CLKO Divisor Index 4A,bit 1 Pull-up See Section 3.1.1. MD[5] MCLK Synchro (see Section 3.1.1. ) Index 4A,bit 2 User defined Async Sync MD[6] PCI_CLKO Programming Index 4A,bit 6 User defined See Section 3.1.1. MD[7] Index 4A,bit 7 Pull-down MD[8] ISA / PCMCIA / Local Bus Index 4A,bit 3 User defined See Section 3.1.1. MD[9] Index 4A,bit 3 User defined MD10 Reserved2 Index 4B,bit 2 Pull down - - MD11 Reserved2 Index 4B,bit 3 Pull down - - MD14 CPU clock Multiplication Index 4B,bit 6 Pull-up See Section 3.1.2. MD15 Reserved2 Not accessible Pull up - - MD16 Reserved2 Not accessible Pull up - - MD17 PCI_CLKO Divisor Index 4A,bit 0 User defined See Section 3.1.1. MD18 HCLK Pad Direction Index 4C,bit 2 Pull-up Input Output MD19 MCLK Pad Direction Index 4C,bit 3 Pull-up Hi-Z Output MD20 DCLK Pad Direction Index 4C,bit 4 User defined Input Output MD21 Reserved2 Index 5F,bit 0 Pull up - - MD23 Reserved2 Index 5F,bit 2 Pull up - - MD24 HCLK PLL Speed Index 5F,bit 3 User defined See Section 3.1.3. MD25 Index 5F,bit 4 User defined MD26 Index 5F,bit 5 User defined MD27 Reserved2 Not accessible Pull up - - MD28 Reserved2 Not accessible Pull up - - MD29 Reserved2 Not accessible Pull up - - MD30 Reserved2 Not accessible Pull up - - MD31 Reserved2 Not accessible Pull up MD32 Reserved2 Not accessible Pull down MD33 Reserved2 Not accessible Pull up MD34 Reserved2 Not accessible Pull down MD35 Reserved2 Not accessible Pull down MD36 Local Bus Boot Device Size Index 4B,bit 0 User defined 8-bit 16-bit MD37 Reserved2 Not accessible Pull down - - MD38 Reserved2 Not accessible Pull down - - MD40 CPU clock Multiplication Index 4B,bit 7 User defined See Section 3.1.2. MD41 Reserved2 Not accessible Pull down - - MD42 Reserved2 Not accessible Pull up - - MD 43 Reserved2 Not accessible Pull down - - Note1: Strap options on TC/PA[3] and DACK_ENC[2:0]/PA[2:0] are required for all the STPC Atlas Configurations (ISA, PCMCIA, Local Bus). Note2: Must be implemented. |
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