Specifications

Chapter 3. Theory of Operation
9
Command and Status Registers
As shown in the "Command and Status Registers Mapping" table, the ZT 6650 has 16 command and
status registers (CSR0 through CSR15) for host communication. The CSRs are mapped in the host
I/O or memory address space and are used for the following purposes:
• Initialization
• Pointers
• Commands
• Status reporting
Command and Status Registers Mapping
Register Meaning Offset from CSR Base Address
(CBIO and CBMA)
CSR0 Bus Mode 00H
CSR1 Transmit poll demand 08H
CSR2 Receive poll demand 10H
CSR3 Receive list base address 18H
CSR4 Transmit list base address 20H
CSR5 Status 28H
CSR6 Operation mode 30H
CSR7 Interrupt enable 38H
CSR8 Missed frame counter 40H
CSR9 Serial ROM and MII management 48H
CSR10 Reserved 50H
CSR11 General-purpose timer 58H
CSR12 General-purpose port 60H
CSR13 Reserved 68H
CSR14 Reserved 70H
CSR15 Watchdog timer 78H
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