28478G-18 Mindspeed Technologies, 28478G-18 Datasheet - Page 45

• Manufacturer Part Number: 28478G-18
• Description: Multichannel Synchronous Communications Controller 208-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of 28478G-18

• Package: 208BGA
• Maximum Data Rate: 32768 Kbps
• Transmission Media Type: Wire
• Power Supply Type: Analog
• Typical Supply Current: 250 mA
• Typical Operating Supply Voltage: 3.3 V
• Minimum Operating Supply Voltage: 3 V
• Maximum Operating Supply Voltage: 3.6 V

In summary, both configuration spaces have unique registers except for the Device ID, Vendor ID, and Revision
ID, which are shared between the configuration spaces for Functions 0 and 1.
MUSYCC is a multifunction device with two sources of interrupts: the HDLC controller interrupts and the expansion
bus physical layer interrupts. MUSYCC uses the INTA* pin for HDLC controller interrupts and the INTB* pin for
interrupts generated by devices on the expansion bus connected to the EINT* pin.
All writable bits in the configuration space are reset to 0 by the hardware reset, PRST* asserted. After reset,
MUSYCC is disabled and responds only to PCI configuration write and PCI configuration read cycles. Write cycles
to reserved bits and registers have no effect. Read cycles to reserved bits always result in 0 being read.
2.2
2.2.1
MUSYCC provides the necessary configuration space for a PCI bus controller to query and configure MUSYCC’s
PCI interface. PCI configuration space consists of a device-independent header region (64 bytes) and a device-
dependent header region (192 bytes). MUSYCC provides the device-independent header section only. Access to
the device-dependent header region results in 0s being read, with no effect on writes.
There are three types of registers available in MUSYCC:
1. Read-Only (RO): Returns a fixed bit pattern if the register is used, or a 0 if the register is unused or reserved.
2. Read-Resettable (RR): Can be reset to 0 by writing a 1 to the register.
3. Read/Write (RW): Retains the value last written to it.
MUSYCC’s Function 0 PCI Configuration Space has 16 dword registers.
registers.
Register 0, Address 00h
Table 2-3.
28478-DSH-002-E
FOOTNOTE:
(1)
Bit Field
31:16
15:0
Registers shared between Function 0 and 1.
Register 0, Address 00h
Vendor ID
Device ID
Name
PCI Configuration Registers
Function 0 Network Controller—PCI Master and Slave
(1)
(1)
Preliminary Information / Mindspeed Proprietary and Confidential
Reset
Value
847xh
14F1h
Mindspeed Technologies
Type
RO
RO
This unique device identification is assigned by the manufacturer. This field
always returns the value 847xh where x can be 1, 2, 4, or 8 depending on the
32, 64, 128, or 256 channel version of the device, respectively.
The unique vendor identification assigned to the manufacturer. This field
always returns the value 14F1h.
®
Tables 2-3
Description
through
2-9
define these
Host Interface
32