Chip Selects
5-2
Am186™CC/CH/CU Microcontrollers User’s Manual
5.2
BLOCK DIAGRAM
Figure 5-1 shows the block diagram for the chip selects.
Figure 5-1
Chip Selects and DRAM Block Diagram
5.3
SYSTEM DESIGN
Table 5-1 lists the chip select signals that are multiplexed with other Am186CC/CH/CU
functions. Pinstraps are sampled only at external reset and do not affect the pin’s other
functions, so they are not shown in this table. Other multiplexed signals, when enabled,
either disable or alter any other functions that use the same pin.
For diagrams of some example applications, see Chapter 3, “System Overview.”
Internal UCS
CS/DRAM
Registers
PCB_AD
Write Data
Read Data
RD
WR
BOOT_WIDTH
(CDRAM)
Refresh Value
Refresh Enable
Current Value
(EDRAM)
Internal Chip
Selects Decode
LCS_DRAM
UCS_DRAM
Internal PCS7–PCS0
DRAM Address
Internal RAS0
(from PADS)
Internal A19-A11
Control to 186
Control from 186
(to PADS)
Internal MCS0
PCS7–PCS0
MCS0
Internal RAS1
Internal CAS0
Internal CAS1
Control
NMCS
UMCS
LM
C
S
PA
C
S
MP
C
S
UCS
MCS3–MCS1
LCS
Control to/from 186
Refresh
Control
Chip Select
Generation
DRAM
Control
Pads
Summary of Contents for Am186 CC
Page 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Page 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Page 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Page 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Page 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Page 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Page 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Page 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Page 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...