ARM ARM DUI 0224I manual ADDR2, NCS4, NCS3, NCS2, ADDR10 NCS1 ADDR11

Models: ARM DUI 0224I

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Memory Expansion Boards

Table E-6 Static memory connector signals (continued)

Pin No.

Signal

Pin No.

Signal

 

 

 

 

63

DATA[31]

64

SBSDA, E2PROM serial interface

 

 

 

data (3.3V signal level)

 

 

 

 

65

ADDR[0]

66

nRESET

 

 

 

 

67

ADDR[1]

68

nBOARDPOR, asserted on

 

 

 

hardware power cycle

 

 

 

 

69

ADDR[2]

70

nFLWP, flash write protect. Drive

 

 

 

HIGH to write to flash.

 

 

 

 

71

ADDR[3]

72

nEARLYRESET, Reset signal.

 

 

 

Differs from nRESET in that it is

 

 

 

not delayed by nWAIT.

 

 

 

 

73

ADDR[4]

74

nWAIT, Wait mode input from

 

 

 

external memory controller. Pull

 

 

 

HIGH if not used.

 

 

 

 

75

ADDR[5]

76

nBURSTWAIT, Synchronous burst

 

 

 

wait input. This is used by the

 

 

 

external device to delay a

 

 

 

synchronous burst transfer if LOW.

 

 

 

Pull to HIGH if not used.

 

 

 

 

77

ADDR[6]

78

CANCELWAIT, If HIGH, this

 

 

 

signal enables the system to recover

 

 

 

from an externally waited transfer

 

 

 

that has taken longer than expected

 

 

 

to finish. Pull LOW if not used.

 

 

 

 

79

ADDR[7]

80

nCS[4]

 

 

 

 

81

ADDR[8]

82

nCS[3]

 

 

 

 

83

ADDR[9]

84

nCS[2]

 

 

 

 

85

ADDR[10]

86

nCS[1]

 

 

 

 

87

ADDR[11]

88

Reserved, do not drive

 

 

 

 

89

ADDR[12]

90

Reserved, do not drive

 

 

 

 

91

ADDR[13]

92

Reserved, do not drive

 

 

 

 

93

ADDR[14]

94

Reserved, do not drive

 

 

 

 

E-18

Copyright © 2003-2010 ARM Limited. All rights reserved.

ARM DUI 0224I

Page 368
Image 368
ARM ARM DUI 0224I manual ADDR2, NCS4, NCS3, NCS2, ADDR10 NCS1 ADDR11