Memory Maps

3.Writes to the LCSR in the VMEchip2 must be 32 bits. LCSR writes of 8 or 16 bits terminate with a TEA signal. Writes to the GCSR may be 8, 16, or 32 bits. Reads to the LCSR and GCSR may be 8, 16, or 32 bits.

4.This area does not return an acknowledge signal. If the processor bus timeout timer is enabled, the access times out and is terminated by a TEA signal.

5.Size is approximate.

6.Port commands to the 82596CA must be written as two 16-bit writes: upper word first and lower word second.

7.DROM (BOOT ROM) appears at $0 following a local peripheral bus reset. The DROM appears at 0 until the DR0 bit is cleared in the PCCchip2. In addition, the ROM0 bit in the BusSwitch must be cleared before the DRAM is accessed.

Detailed I/O Memory Maps

Tables 3-3 through 3-14 give the detailed memory maps for the BusSwitch register, the ECDM CSR register, the DCAM (I2C) register, the VMEchip2 register, the PCCchip2 register, the printer register, the CD2401 Serial Port register, the Ethernet LAN register, the SCSI Controller register, and the BBRAM/TOD Clock register.

3

MVME197LE/D2

3-5

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Motorola MVME197LE user manual Detailed I/O Memory Maps