CS5535 datasheet(114/555 Pages) NSC

114 / 555 page

www.national.com

114

Revision 0.8

KEL Functional Description (Continued)

4.9.12 Related Diverse Device Functions

FA20# and INIT are not passed directly to the processor.

SSM code manipulates equivalent functions in the proces-

sor.

The HCE registers are considered part of the USB opera-

tional register set for some software and hence share the

same memory mapped register space. The GLIU descrip-

tor

for

the

USBs,

MSR_LBAR_KEL1,

and

MSR_LBAR_KEL2 must all be set to the same base. The

GLIU will route accesses at memory offset 100h and above

to the Diverse Device and accesses below 100h to the

USB.

The address decoder in the DIVIL routes accesses to I/O

Addresses 060h and 064h to the KEL or LPC based on the

value of EmulationEnable in HCE_Control (KEL Memory

Offset 100h). If snoop mode is enabled and the Emulation-

Enable bit is not set, writes are made directly to both the

KEL and LPC.

The LPC IRQ1 and IRQ12 outputs are connected to both

KEL and the PIC subsystem. Masking logic in the sub-

system allows the LPC interrupts to be used directly or the

KEL set can be used.

The KEL ASMI is routed through the Diverse Device’s

Standard GLD_MSR_SMI (MSR 51400002h). It may be

masked

off

there,

but

only

cleared

via

MSR_KELX_CTL (MSR 5140001Fh).

4.9.13 Emulation Event Decode

Emulation Events are of two types: frame synchronous and

asynchronous. The conditions for a frame synchronous

interrupt are sampled by the KEL at each SOF interval and,

if an event condition exists, it is signaled at that time. For

asynchronous events, the event is signaled as soon as the

condition exists.

The equation for the synchronous Emulation Event condi-

tion is:

synchronousEvent =

HCE_Control.EmulationEnable

(KEL Memory Offset 100h[0])

and

HCE_Control.CharacterPending

(KEL Memory Offset 100h[2])

and not

HCE_Status.OutputFull

(KEL Memory Offset 10Ch[0]).

When this decode is true, an Emulation Event is generated

at the next SOF. The Event condition is latched until the

decode becomes false.

The equation for the asynchronous Emulation Event condi-

tion is:

asynchronousEvent =

HCE_Control.EmulationEnable

(KEL Memory Offset 100h[0])

and

HCE_Status.InputFull

(KEL Memory Offset 10Ch[1]),

HCE_Control.ExternlIRQEn

(KEL Memory Offset 100h[4])

and

HCE_Control.IRQ1Active

(KEL Memory Offset 100h[6])

HCE_Control.IRQ12Active

(KEL Memory Offset 100h[7]).

CS5535 Datasheet(PDF) 114 Page - National Semiconductor (TI)

CS5535 Datasheet(HTML) 114 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL